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![. Comparative anatomy. Anatomy, Comparative. ii6 COMPARATIVE ANATOMY therefore a product of the splanchnopleure and is lined by endoderm. It grows rapidly, swelling out into the space between the yolk-sac and the chorion and eventually acquires more or less extensive and intimate fusion allantois allantoic cavity extra-embryonic coelom somatopleure yolk sac (splanchno- pleure] albumen. allantoic cavity allantois serosa shell sero-amniotic cavity yolk-sac. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and Stock Photo](https://c8.alamy.com/comp/REFFX3/comparative-anatomy-anatomy-comparative-ii6-comparative-anatomy-therefore-a-product-of-the-splanchnopleure-and-is-lined-by-endoderm-it-grows-rapidly-swelling-out-into-the-space-between-the-yolk-sac-and-the-chorion-and-eventually-acquires-more-or-less-extensive-and-intimate-fusion-allantois-allantoic-cavity-extra-embryonic-coelom-somatopleure-yolk-sac-splanchno-pleure-albumen-allantoic-cavity-allantois-serosa-shell-sero-amniotic-cavity-yolk-sac-please-note-that-these-images-are-extracted-from-scanned-page-images-that-may-have-been-digitally-enhanced-for-readability-coloration-and-REFFX3.jpg ". Comparative anatomy. Anatomy, Comparative. ii6 COMPARATIVE ANATOMY therefore a product of the splanchnopleure and is lined by endoderm. It grows rapidly, swelling out into the space between the yolk-sac and the chorion and eventually acquires more or less extensive and intimate fusion allantois allantoic cavity extra-embryonic coelom somatopleure yolk sac (splanchno- pleure] albumen. allantoic cavity allantois serosa shell sero-amniotic cavity yolk-sac. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and Stock Photo")
RMREFFX3–. Comparative anatomy. Anatomy, Comparative. ii6 COMPARATIVE ANATOMY therefore a product of the splanchnopleure and is lined by endoderm. It grows rapidly, swelling out into the space between the yolk-sac and the chorion and eventually acquires more or less extensive and intimate fusion allantois allantoic cavity extra-embryonic coelom somatopleure yolk sac (splanchno- pleure] albumen. allantoic cavity allantois serosa shell sero-amniotic cavity yolk-sac. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and
RMRE0E1A–. A laboratory manual and text-book of embryology. Embryology. Fig. 20.—Diagrams showing the extent of the mesoderm in rabbit embryos (Kolliker). In A the mesoderm is represented by the pear-shaped area at the caudal end of the embryonic area; in B by the circular area which surrounds the embryonic area. ectoderm at the caudal edge of the germinal area. This forms the extra-embryonic mesoderm and takes no part in forming the body of the embryo. (2) The secondary or intraembryonic mesoderm, which gives rise to body tissues, takes Ectoderm Mesoderm Entoderm. Please note that these images are ext
RMRHJX7A–. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. Extra-Embryonic Endoderm - Trophoblast. Ectoderm Embryonic Endoderm B Fig. 131. Establishment of endoderm and ectoderm in mammalian development. In a embryonic and extra-embryonic portions of the endoderm have arisen from the inner cell mass. In b the ectoderm has broken through the trophoblast and begun to spread out in a layer joined peripherally to the trophoblast. (After Parker and Haswell.). Please note that these images are extracted from scanned pag
RMREEPME–. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. FORMATION OF PROTECTIVE EMBRYONIC MEMBRANES 909 AMNION ALLANTOIS. SPLANCHNOPLEURE OF ALLANTOIC SAC EXTRA- EMBRYONIC MESODERM Fig. 370. Diagrams of extra-embryonic membranes. (A) Transverse section of yolk sac and developing body in teleost and elasmobranch fishes showing relation of body layers to the yolk mass. (B) Transverse section of yolk sac and forming serosa (chorion) in reptiles, birds, and prototherian mammals. (C-E) Diagrams showing extr
RMRE0E14–. A laboratory manual and text-book of embryology. Embryology. Fig. 20.—Diagrams showing the extent of the mesoderm in rabbit embryos (Kolliker). In A the mesoderm is represented by the pear-shaped area at the caudal end of the embryonic area; in B by the circular area which surrounds the embryonic area. ectoderm at the caudal edge of the germinal area. This forms the extra-embryonic mesoderm and takes no part in forming the body of the embryo. (2) The secondary or intraembryonic mesoderm, which gives rise to body tissues, takes Ectoderm Mesoderm Entoderm. Mesodermal segment Ectoderm Archerite
RMRHK6GD–. Biology of the laboratory mouse. Mice as laboratory animals; Mice; Animals, Laboratory; Mice. 34 BIOLOGY OF THE LABORATORY MOUSE. — Ectoplacental cone Reichert's membrane Ectoplacental cavity Extra-embryonic coelom Yolk-sac Yolk cavity Amniotic cavity Embryonic ectoderm Primitive streak Allantois. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Roscoe B. Jackson Memorial Laboratory; Little, Clarence C. (Clarence Cook), b.
RMRN5HAH–. Anatomy, descriptive and applied. Anatomy. 1246 THE OB&ANS OF DIGESTION cavity left outside the embryo, the extra-embryonic coelom, envelops the vitelline or yolk sac.. -Diagram of a longitudinal section of a bryo. Very early, (After Quain.) The relatively slow growth of the margin of the embryonic area and the relati-'ely rapid growth of the axial parts soon come to form a ring of constriction between the embryo and the yolk sac, and a part of the latter—that is, a part of its splanch- * nopleural wall and part of the cavity—becomes enclosed within the embryo to form the primitive alim
RMRGH5BK–. Bulletin of the Bureau of Fisheries. Fisheries; Fish culture. EMBRYOLOGY AND UARVAIv DEVELOPMENT OF TELEOSTEAN FISHES. 95. Fig. 7.—Egg showing advanced stage in differentiation of embryonic axis. EA.embryonicaxis; EES, extra-embryonic area of embryonic shield; GR, genn ring; PP, posterior pole of blastoderm. SET-N. «^. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. United States. Bureau of Fisheries. Washington, D. C. :
RMREERE5–. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. EXTRA - EMBRYONIC TISSUE . FOREGUT-f- I ANTERIOR NTESTINAL 5 PORTAL MIDGUT- NOTOCHORD- NEURAL- 5 ECTODERM !| â 'F II POSTERIOR it INTESTINAL PORTAL A â^. ^ '.V ANTERIOR NEUROPORE CAUDAL FOLD OF AMNION ANTERIOR NEUROPORE. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Nelsen, O
RMRHK6NW–. Biology of the laboratory mouse. Mice as laboratory animals; Mice; Animals, Laboratory; Mice. lO BIOLOGY OF THE LABORATORY MOUSE two regions is still quite distinct (Fig. 8). Strictly speaking the trophecto- derm is also extra-embryonic ectoderm, but as a matter of convenience the term will be used only for the extra-embryonic ectoderm of the egg cylinder. At about 5 days a cleft or cavity, the proamniotic cavity, appears in the embryonic ectoderm (Fig. 7). This is followed very shortly by the appear- ance of a similar cleft in the extra-embryonic ectoderm, and by the fusion of these two, so
RMRDHDTT–. Text-book of embryology. Embryology. 542 EMBEYOLOGY OF THE LOWEE VEETEBBATES oh. distinctly thickened as compared with the outer or pigment layer, and with a narrow optic stalk passing to the thalameneephalon near its floor. In the mouth of the optic cup is the lens but this is seen better a few sections farther on in the series. Turning to the other half of the section it is seen that it is no longer connected with the extra- embryonic somatopleure: in other words the series of sections has now passed the hinder limit of the headfold of the somato- pleure. The pharynx passes out as a pocket
RMRDP65T–. Outlines of zoology. Zoology. 626 BIRDS. folds now consist of a double layer of somatopleure, covered externally by epiblast. The folds meet above the back of the embryo and coalesce. The inner layer forms the true amnion, the outer the false amnion or subzonal membrane. Into the space between the amniotic folds, a diver- ticulum from the posterior region of the gut, the allantois, grows out. Before the end of the first day, blood vessels begin to be developed in the extra-embryonic region of the blastoderm. These form the beginning of the vitelline vessels, which are of great importance in
RMRHK6G3–. Biology of the laboratory mouse. Mice as laboratory animals; Mice; Animals, Laboratory; Mice. — Ectoplacental cone Reichert's membrane Ectoplacental cavity Extra-embryonic coelom Yolk-sac Yolk cavity Amniotic cavity Embryonic ectoderm Primitive streak Allantois. Notochord Ectoplacenta Chorion. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Roscoe B. Jackson Memorial Laboratory; Little, Clarence C. (Clarence Cook), b. 188
RMRD6KA0–. Cunningham's Text-book of anatomy. Anatomy. 22 HUMAN EMBRYOLOGY. Trophoblast. Extra embryonic entoderm Primary mesoderm Fig. 28.—Further Differentiation of Zygote (Hypothetical). Plasmodial trophoblast Cellular trophoblast Amniotic ectoderm Embryonic^ ecto-mesoderm. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Cunningham, D. J. (Daniel John), 1850-1909; Robinson, Arthur, b. 1862, ed. New York, W. Wood
RMRHJX6J–. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. Ectoderm Embryonic Endoderm B Fig. 131. Establishment of endoderm and ectoderm in mammalian development. In a embryonic and extra-embryonic portions of the endoderm have arisen from the inner cell mass. In b the ectoderm has broken through the trophoblast and begun to spread out in a layer joined peripherally to the trophoblast. (After Parker and Haswell.). Please note that these images are extracted from scanned page images that may have been digitally en
RMRHJXB9–. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. ^p^iJi.A'-.IIW.UWl.^/.^VU.'U.--. â Primitive Gut Post-cardinal Vein i / Intra-embryonic Coelom , Extra-embryonic Coelom. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Walter, Herbert Eugene, b. 1867; Sayles, Leonard Perkins, 1902-. New York : Macmillan Co.
RMRD6K91–. Cunningham's Text-book of anatomy. Anatomy. Fig. 33.—Schema of Transverse Section of Zygote along Line B in Fig. 31. Primitive streak Primitive groove Plasmodial trophoblast Cellular trophoblast Mesoderm lining of trophoblast. -Chorion Fig. -Extra-embryonic coelom --Mesoderm of amnion Ectoderm of amnion Amnion cavity Mesoderm covering 'entoderm Entoderm Cavity of entodermal vesicle 34.—Schema of Transverse Section of Zygote along Line C in Fig. 31.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appe
RMREFFWK–. Comparative anatomy. Anatomy, Comparative. allantoic cavity allantois serosa shell sero-amniotic cavity yolk-sac. albumen vitelline membrane belly stalk Fig. 86.—Diagrams showing the extra-embryonic membranes of the chick. The diagrams represent longitudinal sections of the entire egg, the body of the embryo being cut transversely. C, embryo of about five days incubation; D, embryo of about fourteen days incubation. (From Patten, Embryology of the Chick; after Duval.) with the chorion. In the apposed mesodermal layers of the allantois and chorion is developed a rich network of fine blood ves
RMRHRB7N–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. n6 FRANK R. LII.LIE. of this fusion must have been an opening on each side into the yolk-sac ; but this has been roofed over by extension of the B. FIG. 15. Experiment 60. Under i.e. entodermal, surface of the blastoderm. The embryo is anamniote, but otherwise quite perfect, all, allantois ; e.b.c., extra- embryonic body-cavity ; vitelline arteries and veins shown A-£, plane of the sec- tion shown in Fig. 16. The embryo was suspended within the yolk-sac, as described in the text. blastoderm surrounding it. Farther back the w
RMRHJXAT–. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. â Primitive Gut Post-cardinal Vein i / Intra-embryonic Coelom , Extra-embryonic Coelom. Somite-- Dorsal Aorta Mesonephros J â jj Dorsal Mesentery :rf Gut- *V Coelom ^s,. Ventral Mesentery Yolk Sac. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Walter, Herbert Eugene, b. 1867; Sayle
![. The biology of birds. Birds. BIRDS' EGGS 265 begins to be " folded off " from the yolk. As a result of this the embryo is attached by a relatively narrow stalk to the large yolk-sac, over which the extra-embryonic blasto- derm spreads, showing blood-vessels before the end of the first day. The yolk is gradually utilised and, just before hatching, the greatly reduced sac is withdrawn into the body- cavity of the embryo and the navel or umbilical opening closes up. Of great importance are the two embryonic membranes— the amnion which forms a protective hood over the embryo,. Fig. 44. Stock Photo](https://c8.alamy.com/comp/RHK9Y0/the-biology-of-birds-birds-birds-eggs-265-begins-to-be-quot-folded-off-quot-from-the-yolk-as-a-result-of-this-the-embryo-is-attached-by-a-relatively-narrow-stalk-to-the-large-yolk-sac-over-which-the-extra-embryonic-blasto-derm-spreads-showing-blood-vessels-before-the-end-of-the-first-day-the-yolk-is-gradually-utilised-and-just-before-hatching-the-greatly-reduced-sac-is-withdrawn-into-the-body-cavity-of-the-embryo-and-the-navel-or-umbilical-opening-closes-up-of-great-importance-are-the-two-embryonic-membranes-the-amnion-which-forms-a-protective-hood-over-the-embryo-fig-44-RHK9Y0.jpg ". The biology of birds. Birds. BIRDS' EGGS 265 begins to be " folded off " from the yolk. As a result of this the embryo is attached by a relatively narrow stalk to the large yolk-sac, over which the extra-embryonic blasto- derm spreads, showing blood-vessels before the end of the first day. The yolk is gradually utilised and, just before hatching, the greatly reduced sac is withdrawn into the body- cavity of the embryo and the navel or umbilical opening closes up. Of great importance are the two embryonic membranes— the amnion which forms a protective hood over the embryo,. Fig. 44. Stock Photo")
RMRHK9Y0–. The biology of birds. Birds. BIRDS' EGGS 265 begins to be " folded off " from the yolk. As a result of this the embryo is attached by a relatively narrow stalk to the large yolk-sac, over which the extra-embryonic blasto- derm spreads, showing blood-vessels before the end of the first day. The yolk is gradually utilised and, just before hatching, the greatly reduced sac is withdrawn into the body- cavity of the embryo and the navel or umbilical opening closes up. Of great importance are the two embryonic membranes— the amnion which forms a protective hood over the embryo,. Fig. 44.
![. Biology of the laboratory mouse. Mice as laboratory animals; Mice; Animals, Laboratory; Mice. THE EARI.Y EMBRYOLOGY OF THE MOUSE rabbit, guinea pig and their close relatives, proved very puzzling to early embryo legists, for the reason that it is the reverse of the condition found in. IvV.^o" Maternal blood Ectoplacental cone Distal entoderm Proximal entoderm Extra-embryonic ectoderm Embryonic ectoderm Proamniotic cavity Yolk cavity Trophectoderm V ^l£±i Giant cell Degenerating uterine epithelium Fig. 8.—^Longitudinal section at 5 days 12 hours after mating. Projection drawing (X300). a Stock Photo](https://c8.alamy.com/comp/RHK6NE/biology-of-the-laboratory-mouse-mice-as-laboratory-animals-mice-animals-laboratory-mice-the-eariy-embryology-of-the-mouse-rabbit-guinea-pig-and-their-close-relatives-proved-very-puzzling-to-early-embryo-legists-for-the-reason-that-it-is-the-reverse-of-the-condition-found-in-ivvoquot-maternal-blood-ectoplacental-cone-distal-entoderm-proximal-entoderm-extra-embryonic-ectoderm-embryonic-ectoderm-proamniotic-cavity-yolk-cavity-trophectoderm-v-li-giant-cell-degenerating-uterine-epithelium-fig-8longitudinal-section-at-5-days-12-hours-after-mating-projection-drawing-x300-a-RHK6NE.jpg ". Biology of the laboratory mouse. Mice as laboratory animals; Mice; Animals, Laboratory; Mice. THE EARI.Y EMBRYOLOGY OF THE MOUSE rabbit, guinea pig and their close relatives, proved very puzzling to early embryo legists, for the reason that it is the reverse of the condition found in. IvV.^o" Maternal blood Ectoplacental cone Distal entoderm Proximal entoderm Extra-embryonic ectoderm Embryonic ectoderm Proamniotic cavity Yolk cavity Trophectoderm V ^l£±i Giant cell Degenerating uterine epithelium Fig. 8.—^Longitudinal section at 5 days 12 hours after mating. Projection drawing (X300). a Stock Photo")
RMRHK6NE–. Biology of the laboratory mouse. Mice as laboratory animals; Mice; Animals, Laboratory; Mice. THE EARI.Y EMBRYOLOGY OF THE MOUSE rabbit, guinea pig and their close relatives, proved very puzzling to early embryo legists, for the reason that it is the reverse of the condition found in. IvV.^o" Maternal blood Ectoplacental cone Distal entoderm Proximal entoderm Extra-embryonic ectoderm Embryonic ectoderm Proamniotic cavity Yolk cavity Trophectoderm V ^l£±i Giant cell Degenerating uterine epithelium Fig. 8.—^Longitudinal section at 5 days 12 hours after mating. Projection drawing (X300). a
RMREEPM6–. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. 912 CARE AND NOURISHMENT OF THE DEVELOPING YOUNG SINUSOIDS LACUNAE IN TROPHOBLAST ALLANTOIC DIVERTICULUM yTROPHOBLAST ^^V^^rX'l^ BODY OF EMB. Fig. 372. Extra-embryonic membranes in human embryo. (A) Diagrammatic rep- resentation of extra-embryonic membranes in embryo of about 12 days of age, shortly after enclosure within uterine endometrium. (Redrawn and modified from Hertig and Rock, 1941. Carnegie Contr. to Embryology, vol. 29.) (B) Extra-e
RMRHN2C4–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 584 G. A. BANNON AND G. G. BROWN. FIGURE 1. Expansion of the extra-embryonic shell : (a) The embryo is enclosed by the extra-embryonic shell and the egg envelope. Bar = 1.0 mm. (b) The embryo has moulted. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). An
RMRGHE9E–. Bulletin of the Bureau of Fisheries. Fisheries; Fish culture. 122 BULLETIN OF THE BUREAU OF FISHERIES. Pigmentation begins within several hours after the closure of the blastopore. Before the time of hatching (fig. 79) small black chromatophores appear more or less closely aggregated on the dorsal and dorsolateral aspects of the embrvo. The extra-embryonic blastoderm remains free from pigment. Larval development.—Incubation occupies not over 48 hours. The newly hatched larvae (fig. 80) are approximately 4.5 mm. in length and relatively slender. The head is slightly deflected at the anterior
RMRD6154–. Cunningham's Text-book of anatomy. Anatomy. ondary villus â Amnion cavity Amnion -Body-stalk Allantoic diverti- culum rimitive streak eurenteric canal Cavity of entoderm sac Extra-embryonic celom Decidua capsularis Decidua vera Embryonic are Fig. 75.âSchema of a Section of a Pregnant Uterus after the formation of the Intervillous Spaces. parts. (1) The parts which lie between adjacent blood spaces, the primary chorionic villi. (2) The parts which lie in con- tact with the mesoderm of the chorion, and which form with the mesoderm the chorion plate. (3) The parts which cover the maternal tissu
RMRHK6KF–. Biology of the laboratory mouse. Mice as laboratory animals; Mice; Animals, Laboratory; Mice. Maternal blood Extra-embryonic ectoderm Posterior amniotic fold. Ectoplacental cone Yolk cavity Distal entoderm Proximal entoderm Exocoelom Mesoderm Anterior amniotic fold Primitive streak Squamous entoderm Head process Fig. 12.—Sagittal section of embryo of 7 days i hour showing the amniotic folds and the head process. Reichert's membrane omitted. Projection drawing (X300). 17. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability
![. Biology; the story of living things. allantpis chorion., aranion yolk vitelline menabrans .^ allantoic cavity^^^^.^ sWlc ' ,">tolk scut. --yolk ^/itilli-ne iTjsmbran. . yolk' vitelline iriembrane Development of the extra-embryonic membranes in the chick. State the contribution of each germ layer to the amnion, chorion, and yolk sac. (After Patten.) first of which is the upper epimere part immediately flanking the developing neural tube and producing the somites. Beneath the epi- mere lies a small mesomeral portion that later develops the excre- tory and reproductive systems from a ri Stock Photo](https://c8.alamy.com/comp/RHJRXW/biology-the-story-of-living-things-allantpis-chorion-aranion-yolk-vitelline-menabrans-allantoic-cavity-swlc-quotgttolk-scut-yolk-itilli-ne-itjsmbran-yolk-vitelline-iriembrane-development-of-the-extra-embryonic-membranes-in-the-chick-state-the-contribution-of-each-germ-layer-to-the-amnion-chorion-and-yolk-sac-after-patten-first-of-which-is-the-upper-epimere-part-immediately-flanking-the-developing-neural-tube-and-producing-the-somites-beneath-the-epi-mere-lies-a-small-mesomeral-portion-that-later-develops-the-excre-tory-and-reproductive-systems-from-a-ri-RHJRXW.jpg ". Biology; the story of living things. allantpis chorion., aranion yolk vitelline menabrans .^ allantoic cavity^^^^.^ sWlc ' ,">tolk scut. --yolk ^/itilli-ne iTjsmbran. . yolk' vitelline iriembrane Development of the extra-embryonic membranes in the chick. State the contribution of each germ layer to the amnion, chorion, and yolk sac. (After Patten.) first of which is the upper epimere part immediately flanking the developing neural tube and producing the somites. Beneath the epi- mere lies a small mesomeral portion that later develops the excre- tory and reproductive systems from a ri Stock Photo")
RMRHJRXW–. Biology; the story of living things. allantpis chorion., aranion yolk vitelline menabrans .^ allantoic cavity^^^^.^ sWlc ' ,">tolk scut. --yolk ^/itilli-ne iTjsmbran. . yolk' vitelline iriembrane Development of the extra-embryonic membranes in the chick. State the contribution of each germ layer to the amnion, chorion, and yolk sac. (After Patten.) first of which is the upper epimere part immediately flanking the developing neural tube and producing the somites. Beneath the epi- mere lies a small mesomeral portion that later develops the excre- tory and reproductive systems from a ri
RMRD6142–. Cunningham's Text-book of anatomy. Anatomy. l^>-> Pericardial coelom Alimentary canal when the umbilical orifice closes. The extra-embryonic portion is entirely obliterated when the outer surface of the expanding amnion fuses with the inner surface of the chorion (compare Figs. 77 and 78). The Intra-embryonic Coelom.—The intra-embryonic ccelom appears as a series of cleft-like spaces in the margin of the embryonic mesoderm. The spaces fuse together to form a f-shaped cavity (Fig. 89) which separates the peripheral part of the embryonic mesoderm into a parietal or somatic, and a viscer
RMRD6144–. Cunningham's Text-book of anatomy. Anatomy. 72 HUMAN EMBRYOLOGY.. l^>-> Pericardial coelom Alimentary canal when the umbilical orifice closes. The extra-embryonic portion is entirely obliterated when the outer surface of the expanding amnion fuses with the inner surface of the chorion (compare Figs. 77 and 78). The Intra-embryonic Coelom.—The intra-embryonic ccelom appears as a series of cleft-like spaces in the margin of the embryonic mesoderm. The spaces fuse together to form a f-shaped cavity (Fig. 89) which separates the peripheral part of the embryonic mesoderm into a parietal or
RMRN5ETW–. Animal biology. Biology; Zoology; Physiology. Allantois Amniotic cavit orionic villi Head of embryo. Placenta fetal ,Body stalk, vS^S^ umbilicus Degenerating yolk sac Extra-embryonic space Fig. 176. — Diagrammatic sections showing the development of the egg and embryonic membranes of a Mammal. A, blastula showing fundament of embryo at top, before the appearance of the amnion. B, embryo outlined, with developing amnion and yolk sac. C, embryo with amnion further developed and allantois appearing. D, embryo with amnion closing, and allantois joining with outer membrane, or chorion. E, F, embr
![. Chimæroid fishes and their development. Fishes; Chimaeridae. 98 CHIM^ROID FISHES AND THEIR DEVELOPMENT.. Fig. 75. — Detail of extra-embryonic region of embryo of fig. 73. e. Ecloderm ; '"t mesoblasi; >"e(/, 'Hf^', gigantic yolk-cells ; t?, vacuole 3/t', yolk-enloderm. have already seen, to the walls of the gut, since it passes to them yolk masses, large and small, and perhaps also dissolved yolk material. In evidence of the nutritive value of this material witness numerous mitoses in the adjacent (inmost) cells of the entoderm—one of which appears in the present section. In fig. Stock Photo](https://c8.alamy.com/comp/RJ5K1P/chimroid-fishes-and-their-development-fishes-chimaeridae-98-chimroid-fishes-and-their-development-fig-75-detail-of-extra-embryonic-region-of-embryo-of-fig-73-e-ecloderm-quott-mesoblasi-gtquote-hf-gigantic-yolk-cells-t-vacuole-3t-yolk-enloderm-have-already-seen-to-the-walls-of-the-gut-since-it-passes-to-them-yolk-masses-large-and-small-and-perhaps-also-dissolved-yolk-material-in-evidence-of-the-nutritive-value-of-this-material-witness-numerous-mitoses-in-the-adjacent-inmost-cells-of-the-entodermone-of-which-appears-in-the-present-section-in-fig-RJ5K1P.jpg ". Chimæroid fishes and their development. Fishes; Chimaeridae. 98 CHIM^ROID FISHES AND THEIR DEVELOPMENT.. Fig. 75. — Detail of extra-embryonic region of embryo of fig. 73. e. Ecloderm ; '"t mesoblasi; >"e(/, 'Hf^', gigantic yolk-cells ; t?, vacuole 3/t', yolk-enloderm. have already seen, to the walls of the gut, since it passes to them yolk masses, large and small, and perhaps also dissolved yolk material. In evidence of the nutritive value of this material witness numerous mitoses in the adjacent (inmost) cells of the entoderm—one of which appears in the present section. In fig. Stock Photo")
RMRJ5K1P–. Chimæroid fishes and their development. Fishes; Chimaeridae. 98 CHIM^ROID FISHES AND THEIR DEVELOPMENT.. Fig. 75. — Detail of extra-embryonic region of embryo of fig. 73. e. Ecloderm ; '"t mesoblasi; >"e(/, 'Hf^', gigantic yolk-cells ; t?, vacuole 3/t', yolk-enloderm. have already seen, to the walls of the gut, since it passes to them yolk masses, large and small, and perhaps also dissolved yolk material. In evidence of the nutritive value of this material witness numerous mitoses in the adjacent (inmost) cells of the entoderm—one of which appears in the present section. In fig.
RMRN5E30–. Animal biology. Zoology; Biology. o . o o y ; .0.0 o o 'o ? O o o .o o?0.0.0 Amniotic fold A mniofic fold A mniofic coiv/fy Extra-embryonic coelom Shell. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Wolcott, Robert Henry, 1868-1934; University of Nebraska (Lincoln campus). Dept. of Zoology. New York ; London : McGraw-Hill Book Company, Inc.
RMRDGEW8–. Elementary text-book of zoology. Yolk. â waUj future Serosa, Yolk-sac Wall. Yolk in Yolk-sac. Hypoblast of Yolk-sac. Extra-embryonic Coelom. Mesoblast of- . Yolk-sac. S f Mesoblast. 2 I Epibli Alimentary Canal. Embrj'o. Amniotic Fold. Extra- embryonic Ccelom.. Yolk-sac. Embryo. miotic Cavity.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Masterman, Arthur Thomas. Edinburgh, E. & S. Livingstone
![. The anatomical record. Anatomy; Anatomy. VASCULAKIZATIOX PHENOMENA 337 a total period of forty-eight hours (figs. 8, 9 and 10). No at- tempt will be made at present to set forth the processes which inter-ene l^etween the stages of thirty-two and fortv-eight hours. The ]:)roanmion (fig. 8), a region normally devoid of meso- derm, contains a rounded jiouch which is continuous anteriorly with the extra-embryonic coelom. The cut edges of the ectoder- mal and entodermal layers of the proamnion have fused forming a blind sac around the enclosed coelomic pouch; likewise the cut. Fig. S .Section th Stock Photo](https://c8.alamy.com/comp/RNAF25/the-anatomical-record-anatomy-anatomy-vasculakizatiox-phenomena-337-a-total-period-of-forty-eight-hours-figs-8-9-and-10-no-at-tempt-will-be-made-at-present-to-set-forth-the-processes-which-inter-ene-letween-the-stages-of-thirty-two-and-fortv-eight-hours-the-roanmion-fig-8-a-region-normally-devoid-of-meso-derm-contains-a-rounded-jiouch-which-is-continuous-anteriorly-with-the-extra-embryonic-coelom-the-cut-edges-of-the-ectoder-mal-and-entodermal-layers-of-the-proamnion-have-fused-forming-a-blind-sac-around-the-enclosed-coelomic-pouch-likewise-the-cut-fig-s-section-th-RNAF25.jpg ". The anatomical record. Anatomy; Anatomy. VASCULAKIZATIOX PHENOMENA 337 a total period of forty-eight hours (figs. 8, 9 and 10). No at- tempt will be made at present to set forth the processes which inter-ene l^etween the stages of thirty-two and fortv-eight hours. The ]:)roanmion (fig. 8), a region normally devoid of meso- derm, contains a rounded jiouch which is continuous anteriorly with the extra-embryonic coelom. The cut edges of the ectoder- mal and entodermal layers of the proamnion have fused forming a blind sac around the enclosed coelomic pouch; likewise the cut. Fig. S .Section th Stock Photo")
RMRNAF25–. The anatomical record. Anatomy; Anatomy. VASCULAKIZATIOX PHENOMENA 337 a total period of forty-eight hours (figs. 8, 9 and 10). No at- tempt will be made at present to set forth the processes which inter-ene l^etween the stages of thirty-two and fortv-eight hours. The ]:)roanmion (fig. 8), a region normally devoid of meso- derm, contains a rounded jiouch which is continuous anteriorly with the extra-embryonic coelom. The cut edges of the ectoder- mal and entodermal layers of the proamnion have fused forming a blind sac around the enclosed coelomic pouch; likewise the cut. Fig. S .Section th
RMRDGF9B–. Elementary text-book of zoology. COLUMBA. 379 are optical distinctions and there is no real morphological distinction between the two areas. Fig. 274.—Cross-section through a Blastoderm of ABOUT 24 hours. A Neural Groove. Hypoblast.. Epiblast. Yolk. Archenteron. Mesoblast. Notochord. A shows the whole blastoderin lymg on the yolk. B shows the median part only more highly magniiied. fig. 275.—Transverse Section of an Embryo Chick of the Second Day. {Ad nat.) (Slightly diagrammatic.) Lateral Fold of Amnion. Extra-embryonic Coalom. Nerve Cord. Notochord. Protovertebra. Amniotic Fold.. Please n
RMRD6157–. Cunningham's Text-book of anatomy. Anatomy. 58 HUMAN EMBRYOLOGY. begins to circulate within them and the plasmodium becomes divided into three series of Spongy layer | Placental area Unchanged layer of decidua stratum spongiosum Intervillous Maternal blood-ve Muscular wall of uteru Uterine tube Mesoderm lining trophoblast Trophoblast Unchanged part of gland Dilated part of gland' Cavity of uterus J. ondary villus â Amnion cavity Amnion -Body-stalk Allantoic diverti- culum rimitive streak eurenteric canal Cavity of entoderm sac Extra-embryonic celom Decidua capsularis Decidua vera Embryonic
![. The chordates. Chordata. 292 Basic Structure of Vertebrates. Fig. 241. Diagram of the fetal structures of a mammal. Sagittal section. The broken lines represent mesoderm. (A) Amnion; (AL) cavity of allantois; (B) brain; (C) chorion; (E) enteron; (EX) extra-embryonic coelom; (H) heart; (NC) noto- chord; (NT) neural tube; (P) placental region of allantois and chorion; (SM) somatopleure; (SP) splanchnopleure; (V) chorionic villi; (YS) cavity of yolk-sac. (Courtesy, Neal and Band: "Chordate Anatomy," Philadelphia, The Blakiston Company.) or embryonic body-wall (Figs. 239, 240). The emb Stock Photo](https://c8.alamy.com/comp/RJ50F7/the-chordates-chordata-292-basic-structure-of-vertebrates-fig-241-diagram-of-the-fetal-structures-of-a-mammal-sagittal-section-the-broken-lines-represent-mesoderm-a-amnion-al-cavity-of-allantois-b-brain-c-chorion-e-enteron-ex-extra-embryonic-coelom-h-heart-nc-noto-chord-nt-neural-tube-p-placental-region-of-allantois-and-chorion-sm-somatopleure-sp-splanchnopleure-v-chorionic-villi-ys-cavity-of-yolk-sac-courtesy-neal-and-band-quotchordate-anatomyquot-philadelphia-the-blakiston-company-or-embryonic-body-wall-figs-239-240-the-emb-RJ50F7.jpg ". The chordates. Chordata. 292 Basic Structure of Vertebrates. Fig. 241. Diagram of the fetal structures of a mammal. Sagittal section. The broken lines represent mesoderm. (A) Amnion; (AL) cavity of allantois; (B) brain; (C) chorion; (E) enteron; (EX) extra-embryonic coelom; (H) heart; (NC) noto- chord; (NT) neural tube; (P) placental region of allantois and chorion; (SM) somatopleure; (SP) splanchnopleure; (V) chorionic villi; (YS) cavity of yolk-sac. (Courtesy, Neal and Band: "Chordate Anatomy," Philadelphia, The Blakiston Company.) or embryonic body-wall (Figs. 239, 240). The emb Stock Photo")
RMRJ50F7–. The chordates. Chordata. 292 Basic Structure of Vertebrates. Fig. 241. Diagram of the fetal structures of a mammal. Sagittal section. The broken lines represent mesoderm. (A) Amnion; (AL) cavity of allantois; (B) brain; (C) chorion; (E) enteron; (EX) extra-embryonic coelom; (H) heart; (NC) noto- chord; (NT) neural tube; (P) placental region of allantois and chorion; (SM) somatopleure; (SP) splanchnopleure; (V) chorionic villi; (YS) cavity of yolk-sac. (Courtesy, Neal and Band: "Chordate Anatomy," Philadelphia, The Blakiston Company.) or embryonic body-wall (Figs. 239, 240). The emb
RMRHK6MB–. Biology of the laboratory mouse. Mice as laboratory animals; Mice; Animals, Laboratory; Mice. Distal entoderm â Proximal entoderm Extra-embryonic ectoderm Embryonic ectoderm. Maternal blood Secondary giant cell © ^3- ^®' (5s/5.^ 8^1 ^=2:^^0^ Ectoplacental cone. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Roscoe B. Jackson Memorial Laboratory; Little, Clarence C. (Clarence Cook), b. 1888; Snell, George D. (George Dav
RMRDGF90–. Elementary text-book of zoology. Epiblast. Yolk. Archenteron. Mesoblast. Notochord. A shows the whole blastoderin lymg on the yolk. B shows the median part only more highly magniiied. fig. 275.—Transverse Section of an Embryo Chick of the Second Day. {Ad nat.) (Slightly diagrammatic.) Lateral Fold of Amnion. Extra-embryonic Coalom. Nerve Cord. Notochord. Protovertebra. Amniotic Fold.. Mesoblast. g Epiblast./ iJ Hypoblast of Yolk-sac, Splanchnic Mesoblast. The first appearance of the embryo is the neural tube which arises immediately in front of the primitive streak. Paired neural folds gr
RMRGH5B0–. Bulletin of the Bureau of Fisheries. Fisheries; Fish culture. Fig. 7.—Egg showing advanced stage in differentiation of embryonic axis. EA.embryonicaxis; EES, extra-embryonic area of embryonic shield; GR, genn ring; PP, posterior pole of blastoderm. SET-N. «^. -^P Fig. 8.—Same as figure 7. lateral view.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. United States. Bureau of Fisheries. Washington, D. C. : Govt. Print. Off
RMRJ700D–. Chordate morphology. Morphology (Animals); Chordata. embryo. J â 'umbilicus yolk sac Figure 7-19. Amnion and placental development of the pig. A, 1 6 to 1 7-somite embryo and extra- embryonic membranes seen in sagittal section; B, 4 to 5-week foetus in its membranes; C, diagram- matic detail of placental relationship to maternal tissues. (After Nelsen, 1953). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Jollie, Malcolm
RMRDGEWG–. Elementary text-book of zoology. 428 CHORD AT A. Fig. 308.âThr Evolution of thk Fcetal Membranes OF Vertebrata.. Yolk. â waUj future Serosa, Yolk-sac Wall. Yolk in Yolk-sac. Hypoblast of Yolk-sac. Extra-embryonic Coelom. Mesoblast of- . Yolk-sac. S f Mesoblast. 2 I Epibli Alimentary Canal. Embrj'o. Amniotic Fold. Extra- embryonic Ccelom.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Masterman, Arthur Thomas. Edinburgh,
![. Biology of the laboratory mouse. Mice as laboratory animals; Mice; Animals, Laboratory; Mice. THE EARLY EMBRYOLOGY OF THE MOUSE 19 Maternal blood Ectoplacental cavity Chorion Exocoelom - Amnion Fore-gut Amniotic cavity Embryonic ectoderm Head process Squamous entoderm. Secondary giant cell '"— Ectoplacental cone Distal entoderm Proximal entoderm Extra-embryonic ectoderm 03 Mesoderm AUantois Primitive streak Fig. 13.—Sagittal section of embryo of 7 days 6 hours showing completion of amnion formation. Reichert's membrane omitted. Projection drawing (X200).. Please note that these images a Stock Photo](https://c8.alamy.com/comp/RHK6K4/biology-of-the-laboratory-mouse-mice-as-laboratory-animals-mice-animals-laboratory-mice-the-early-embryology-of-the-mouse-19-maternal-blood-ectoplacental-cavity-chorion-exocoelom-amnion-fore-gut-amniotic-cavity-embryonic-ectoderm-head-process-squamous-entoderm-secondary-giant-cell-quot-ectoplacental-cone-distal-entoderm-proximal-entoderm-extra-embryonic-ectoderm-03-mesoderm-auantois-primitive-streak-fig-13sagittal-section-of-embryo-of-7-days-6-hours-showing-completion-of-amnion-formation-reicherts-membrane-omitted-projection-drawing-x200-please-note-that-these-images-a-RHK6K4.jpg ". Biology of the laboratory mouse. Mice as laboratory animals; Mice; Animals, Laboratory; Mice. THE EARLY EMBRYOLOGY OF THE MOUSE 19 Maternal blood Ectoplacental cavity Chorion Exocoelom - Amnion Fore-gut Amniotic cavity Embryonic ectoderm Head process Squamous entoderm. Secondary giant cell '"— Ectoplacental cone Distal entoderm Proximal entoderm Extra-embryonic ectoderm 03 Mesoderm AUantois Primitive streak Fig. 13.—Sagittal section of embryo of 7 days 6 hours showing completion of amnion formation. Reichert's membrane omitted. Projection drawing (X200).. Please note that these images a Stock Photo")
RMRHK6K4–. Biology of the laboratory mouse. Mice as laboratory animals; Mice; Animals, Laboratory; Mice. THE EARLY EMBRYOLOGY OF THE MOUSE 19 Maternal blood Ectoplacental cavity Chorion Exocoelom - Amnion Fore-gut Amniotic cavity Embryonic ectoderm Head process Squamous entoderm. Secondary giant cell '"— Ectoplacental cone Distal entoderm Proximal entoderm Extra-embryonic ectoderm 03 Mesoderm AUantois Primitive streak Fig. 13.—Sagittal section of embryo of 7 days 6 hours showing completion of amnion formation. Reichert's membrane omitted. Projection drawing (X200).. Please note that these images a
RMRJ6YYW–. Chordate morphology. Morphology (Animals); Chordata. J â 'umbilicus yolk sac Figure 7-19. Amnion and placental development of the pig. A, 1 6 to 1 7-somite embryo and extra- embryonic membranes seen in sagittal section; B, 4 to 5-week foetus in its membranes; C, diagram- matic detail of placental relationship to maternal tissues. (After Nelsen, 1953). chorionic folds areolae of villi (fit into secretion-filled pockets of uterine wall). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of thes
![. An elementary course of practical zoology. Zoology. CH. XI ALLANTOIS S8i slightly later stage, transverse section; C, stage with completed amnion and commencing allantois ; D, stage in which the allantois has begun to envelop the embryo and yolk-sac. The ectoderm is represented by a blue, the endoderm by a red line ; the mesoderm is grey. all. allantois ; alf. the same growing round the embryo and yolk-sac ; am. amnion ; am./", amniotic fold ; an. anus; br, brain; ccel. ccelome; caP. extra-embryonic coelome ; kt. heart; tns.eni. mesenteron ; mtk, mouth; nch. nolochorA',sp.cd. spinal cor Stock Photo](https://c8.alamy.com/comp/RDGFGF/an-elementary-course-of-practical-zoology-zoology-ch-xi-allantois-s8i-slightly-later-stage-transverse-section-c-stage-with-completed-amnion-and-commencing-allantois-d-stage-in-which-the-allantois-has-begun-to-envelop-the-embryo-and-yolk-sac-the-ectoderm-is-represented-by-a-blue-the-endoderm-by-a-red-line-the-mesoderm-is-grey-all-allantois-alf-the-same-growing-round-the-embryo-and-yolk-sac-am-amnion-amquot-amniotic-fold-an-anus-br-brain-ccel-ccelome-cap-extra-embryonic-coelome-kt-heart-tnseni-mesenteron-mtk-mouth-nch-nolochoraspcd-spinal-cor-RDGFGF.jpg ". An elementary course of practical zoology. Zoology. CH. XI ALLANTOIS S8i slightly later stage, transverse section; C, stage with completed amnion and commencing allantois ; D, stage in which the allantois has begun to envelop the embryo and yolk-sac. The ectoderm is represented by a blue, the endoderm by a red line ; the mesoderm is grey. all. allantois ; alf. the same growing round the embryo and yolk-sac ; am. amnion ; am./", amniotic fold ; an. anus; br, brain; ccel. ccelome; caP. extra-embryonic coelome ; kt. heart; tns.eni. mesenteron ; mtk, mouth; nch. nolochorA',sp.cd. spinal cor Stock Photo")
RMRDGFGF–. An elementary course of practical zoology. Zoology. CH. XI ALLANTOIS S8i slightly later stage, transverse section; C, stage with completed amnion and commencing allantois ; D, stage in which the allantois has begun to envelop the embryo and yolk-sac. The ectoderm is represented by a blue, the endoderm by a red line ; the mesoderm is grey. all. allantois ; alf. the same growing round the embryo and yolk-sac ; am. amnion ; am./", amniotic fold ; an. anus; br, brain; ccel. ccelome; caP. extra-embryonic coelome ; kt. heart; tns.eni. mesenteron ; mtk, mouth; nch. nolochorA',sp.cd. spinal cor
RMRDYTAC–. Principles of modern biology. Biology. Reproduction in Multicellular Animals - 38V AMNIONIC CAVITY EXTRA- EMBRYONIC COELOM. ALLANTOIS EXTRA- EMBRYONIC COELOM PLACENTA UMBILICAL ARTERY UMBILICAL VEIN •AMNIONIC CAVITY Fig. 21-11. Development of the embryonic membranes and the placenta in man and higher mammals generally. Compare with membranes of the bird's egg (Fig. 21-12), noting differ- ences in the amnion, allantois, and yolk sac. oviparous (egg-laying) habits of their aquatic ancestors. Eggs laid on land, however, are al- ways covered by a shell and other protective membranes, for otherwi
RMRHRB9N–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. I 12 FRANK R. LILLIE. extra-embryonic somatopleure on one side, while on the other the original gap in the somatopleure is still open (see Fig. 13). In this region, the somatopleure for some distance external to. FIG. 12. Experiment 36. Surface view of embryo ; upper surface of blastoderm. The embryo is anamniote, except for a rudimentary tail-fold, all., allantois ; /., pel- lucid area. A-B, plane of section shown in Fig. 13 ; /., fold of somatopleure. the part destined for the body-wall is thrown on both sides into irregul
![. Cunningham's Text-book of anatomy. Anatomy. j .Ectoderm of amnion Allantoic diverticulum 1 of entoderm vesicle â â¢Body stalk mesoderm -â¢-.Extra-embryonic ccelom .Entoderm ^ Mesoderm covering of ' "entoderm vesicle eurenteric canal lty of entodermal vesicle Fig. 32.âSchema of Sagittal Section of Zygote along Line A in Fig. 31. Plasmodial trophoblast Cellular trophoblast Neural groove Mesoderm lining of trophoblast Amnion cavity Extra-embryonic ccelom , Mesoderm of amnion Ectoderm of amnion Mesoderm covering entoderm Entoderm 43 Cavity of entodermal ^J vesicle The Formation of the Notoc Stock Photo](https://c8.alamy.com/comp/RD6K99/cunninghams-text-book-of-anatomy-anatomy-j-ectoderm-of-amnion-allantoic-diverticulum-1-of-entoderm-vesicle-body-stalk-mesoderm-extra-embryonic-ccelom-entoderm-mesoderm-covering-of-quotentoderm-vesicle-eurenteric-canal-lty-of-entodermal-vesicle-fig-32schema-of-sagittal-section-of-zygote-along-line-a-in-fig-31-plasmodial-trophoblast-cellular-trophoblast-neural-groove-mesoderm-lining-of-trophoblast-amnion-cavity-extra-embryonic-ccelom-mesoderm-of-amnion-ectoderm-of-amnion-mesoderm-covering-entoderm-entoderm-43-cavity-of-entodermal-j-vesicle-the-formation-of-the-notoc-RD6K99.jpg ". Cunningham's Text-book of anatomy. Anatomy. j .Ectoderm of amnion Allantoic diverticulum 1 of entoderm vesicle â â¢Body stalk mesoderm -â¢-.Extra-embryonic ccelom .Entoderm ^ Mesoderm covering of ' "entoderm vesicle eurenteric canal lty of entodermal vesicle Fig. 32.âSchema of Sagittal Section of Zygote along Line A in Fig. 31. Plasmodial trophoblast Cellular trophoblast Neural groove Mesoderm lining of trophoblast Amnion cavity Extra-embryonic ccelom , Mesoderm of amnion Ectoderm of amnion Mesoderm covering entoderm Entoderm 43 Cavity of entodermal ^J vesicle The Formation of the Notoc Stock Photo")
RMRD6K99–. Cunningham's Text-book of anatomy. Anatomy. j .Ectoderm of amnion Allantoic diverticulum 1 of entoderm vesicle â â¢Body stalk mesoderm -â¢-.Extra-embryonic ccelom .Entoderm ^ Mesoderm covering of ' "entoderm vesicle eurenteric canal lty of entodermal vesicle Fig. 32.âSchema of Sagittal Section of Zygote along Line A in Fig. 31. Plasmodial trophoblast Cellular trophoblast Neural groove Mesoderm lining of trophoblast Amnion cavity Extra-embryonic ccelom , Mesoderm of amnion Ectoderm of amnion Mesoderm covering entoderm Entoderm 43 Cavity of entodermal ^J vesicle The Formation of the Notoc
RMRHK5GW–. The biology of twins (mammals). Twins. Fig, io Fig. II Figs, io, ii.—Two eggs of the armadillo, drawn as before, partly overlapping. The upper egg (stage III) shows the ectoderm (ec) round- ing up into a ball and the endoderm (en) in the form of a continuous layer beneath the ectoderm. The apical pole is at -Y. The lower egg (stage IV) shows the ectoderm (ec) rolled into a ball and nearly sur- rounded with endoderm (en). Trophoblast has been thickened into Trager (Tra) at the upper pole and the remainder is called diplotropho- blast (dtr); extra-embryonic cavity (exc). (Modified from Patters
RMRN4Y2Y–. Animal biology. Zoology; Biology. Body stalk. Last trace of extra-em- bryonic coelom Placental villi t/eura/ groove Fig. 343.—Diagrammatic representation of the stages in mammalian development. A, egg cell, in section. B, two-celled stage. C, morula. D, section of morula. E, blastula, in section. F, development of entoderm. G, formation of amniotic cavity, and separation of embryonic disc into entoderm and ectoderm, i/, development of mesoderm and extra-embryonic coelom. 7, formation of body stalk and beginning of placenta. /, cross section of same stage as I. K, embryo in amniotic cavity, t
RMRN5EDH–. Animal biology. Zoology; Biology. Doay StCffk. Lasttrace of extra- em bryonic coelom PIcfcentcrl villi Neuroft groove Fig. 287.—Diagrammatic representation of the stages in mammalian development. A, egg cell, in section. B, two-celled stage. C, morula. Z), section of morula. E, blastula, in section. F, development of entoderm. G, formation of amniotic cavity, and separation of embryonic disc into entoderm and ectoderm. H, development of mesoderm and extra-embryonic coelom. 7, formation of body stalk and beginning of placenta. J, cross section of same stage as I. A', embryo in amniotic cavity
RMRHK6FC–. Biology of the laboratory mouse. Mice as laboratory animals; Mice; Animals, Laboratory; Mice. Reichert's membrane Yolk-sac Amnion Exocoelom Mid-gut Blood island Ectoplacenta Neural tube Allantois. Exocoelom Yolk-sac Reichert's membrane Mid-gut Dorsal aorta Fig. 20.—Frontal sections showing development of extra-embryonic membranes and formation of mid-gut. The sections are viewed from the head towards the tail, so that the right side of the embryo is on the left side of the drawing, and vice versa. .. 8 days 11 hours, ii somites, through oth somite. Reichert's membrane omitted. (X60.) B. S d
RMRHG4PX–. Biology of the laboratory mouse. Mice as laboratory animals; Mice; Animals, Laboratory; Mice. THE EARLY EMBRYOLOGY OF THE MOUSE g elongated nuclei, and a ventral, more lightly staining portion with round nuclei* (Fig. 6). The former gives rise to various extra-embryonic struc- fa ^. t% r-3 uterine lumen Droplets of secretion Extra-embryonic ectoderm Embryonic ectoderm Proximal entoderm Distal entoderm Trophectoderm Yolk cavity — Giant cell Degenerating uterine epithelium. % (^W ^^' ^. Soh*.n Fig. 6.—^Longitudinal section of early egg cylinder stage at 4 days 15 hours after mating. Projection
RMRDJJ3J–. The biology of twins (mammals) . Twins. Fig. io Fig. II Figs, io, ii.—^Two eggs of the armadillo, drawn as before, partly overlapping. The upper egg (stage III) shows the ectoderm (ec) round- ing up into a ball and the endoderm (en) in the form of a continuous layer beneath the ectoderm. The apical pole is at X. The lower egg (stage IV) shows the ectoderm (ec) rolled into a ball and nearly sur- rounded with endoderm (en). Trophoblast has been thickened into Trager (Tra) at the upper pole and the remainder is called diplotropho- blast (dif); extra-embryonic cavity (ea; c). (Modified from Patt
![. Animal biology. Zoology; Biology. Extra-embryonic coelom Amniotic cavity Yolk stalk. O o' *> ^' o. o o o ? 00" Allahtois Fig. 270.—^Diagrams of the development of a bird's egg. A, cross section of an amphibian embryo for comparison with 5, which is a cross section of an avian embryo at an early stage. C, D, and E, stages in the development of amnion and allantois in the bird, shown in longitudinal section. Ectoderm is shown in C, D, and £ by a solid line, entoderm by dashes, mesoderm in mass by crosslines, and somatic mesoderm and splanchnic mesoderm by dots. 411. Allantois.—Since th Stock Photo](https://c8.alamy.com/comp/RN518H/animal-biology-zoology-biology-extra-embryonic-coelom-amniotic-cavity-yolk-stalk-o-o-gt-o-o-o-o-00quot-allahtois-fig-270diagrams-of-the-development-of-a-birds-egg-a-cross-section-of-an-amphibian-embryo-for-comparison-with-5-which-is-a-cross-section-of-an-avian-embryo-at-an-early-stage-c-d-and-e-stages-in-the-development-of-amnion-and-allantois-in-the-bird-shown-in-longitudinal-section-ectoderm-is-shown-in-c-d-and-by-a-solid-line-entoderm-by-dashes-mesoderm-in-mass-by-crosslines-and-somatic-mesoderm-and-splanchnic-mesoderm-by-dots-411-allantoissince-th-RN518H.jpg ". Animal biology. Zoology; Biology. Extra-embryonic coelom Amniotic cavity Yolk stalk. O o' *> ^' o. o o o ? 00" Allahtois Fig. 270.—^Diagrams of the development of a bird's egg. A, cross section of an amphibian embryo for comparison with 5, which is a cross section of an avian embryo at an early stage. C, D, and E, stages in the development of amnion and allantois in the bird, shown in longitudinal section. Ectoderm is shown in C, D, and £ by a solid line, entoderm by dashes, mesoderm in mass by crosslines, and somatic mesoderm and splanchnic mesoderm by dots. 411. Allantois.—Since th Stock Photo")
RMRN518H–. Animal biology. Zoology; Biology. Extra-embryonic coelom Amniotic cavity Yolk stalk. O o' *> ^' o. o o o ? 00" Allahtois Fig. 270.—^Diagrams of the development of a bird's egg. A, cross section of an amphibian embryo for comparison with 5, which is a cross section of an avian embryo at an early stage. C, D, and E, stages in the development of amnion and allantois in the bird, shown in longitudinal section. Ectoderm is shown in C, D, and £ by a solid line, entoderm by dashes, mesoderm in mass by crosslines, and somatic mesoderm and splanchnic mesoderm by dots. 411. Allantois.—Since th
RMRHK5GD–. The biology of twins (mammals). Twins. TWINNING IN DASYPUS NOVEMCINCTUS 45 Trager, while the thin-walled part of the trophoblast is known as the diplotrophoblast (dtr). TrCi trpi. Fig, 12,—Au armadillo egg (stage V) attached by the Trager to uterus, and shown as if torn away at Tra. The ectoderm {ec) is a hollow vesicle. The apical pole is at X. Endoderm {en) joins diplo- trophoblast {dtr) in a ring {r). The trophoderm plate {tr pi) lies within the Trager collar {Tra); ectodermal layer of amnion {cc am)', amniotic cavity {ante); mesoderm {ms); much enlarged extra-embryonic cavity {exc). (Mod
RMRDJJ3D–. The biology of twins (mammals) . Twins. TWINNING IN DASYPUS NOVEMCINCTUS 45 Trager, while the thin-walled part of the trophoblast is known as the diplotrophoblast (dtr). trfl. dtr Fig. 12.â^An armadillo egg (stage V) attached by the Trager to uterus, and shown as if torn away at Tra. The ectoderm (ec) is a hollow vesicle. The apical pole is at X. Endoderm {en) joins diplo- trophoblast {dlr) in a ring (»â ). The trophoderm plate {tr pi) lies within the Trager collar (Tra); ectodermal layer of anmion (ec am); amniotic cavity (o»»c); mesoderm (»»j); much enlarged extra-embryonic cavity (ex
RMREF853–. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. 440 GASTRULATION GERM RING EXTRA-EMBRYONIC BLASTODERM. GERM RING DORSAL LIP OF BLASTOPORE CLOSING BLASTOPORAL RING Fig. 211. Gastrulation in teleost fishes. (A-F after Wilson, 1889; G from Kerr, '19, after Kopsch.) (A) Sea bass. 16 hours, embryonic shield becoming evident, marks beginning of germ ring. (B) Germ ring well developed. Surface view of blastoderm of 20 hours. (C) Side view of blastoderm shown in (B). (D) Side view, 25 hours. (E) Surfac
RMRN5E3B–. Animal biology. Zoology; Biology. 384 METAZOAN PHYLA be rolled about or be subjected to blows from without. The outer wall of the amniotic fold is continuous with a fold of the somatopleure which grows down around the yolk sac. As the splanchnopleure also extends down around the yolk sac a space is formed between the somatopleure and splanchnopleure, the wall of which is mesoderm and which is known as the extra-embryonic coelom (Fig. 270 D). ^Nerve corcf ??Nofochorct Nerve cord No to chord Coelom. o . o o y ; .0.0 o o 'o ? O o o .o o?0.0.0 Amniotic fold A mniofic fold A mniofic coiv/fy Extra
![. Chimæroid fishes and their development. Fishes; Chimaeridae. DETAILS OF EARLY EMBRYO. 8l B n â¢â â -â V / »--Ws' â¢"If"/!' â "v n n. ^^ Figs. 71 A-E and continued F-l on page 82.âTransverse sections of late gastrula shown in Plate V, fig. 36. The sections pass forward ; the first of the series. A, traverses the tail folds; the last, I, the head region of the early embryo. 0» Tongue of mesoblasl cells representing the urogenital aniage; (>, megaspheres in process of passing through the yolk-entoblast; fjc, body cavity; c, points in extra-embryonic region where the ectode Stock Photo](https://c8.alamy.com/comp/RJ71X3/chimroid-fishes-and-their-development-fishes-chimaeridae-details-of-early-embryo-8l-b-n-v-ws-quotifquot!-quotv-n-n-figs-71-a-e-and-continued-f-l-on-page-82transverse-sections-of-late-gastrula-shown-in-plate-v-fig-36-the-sections-pass-forward-the-first-of-the-series-a-traverses-the-tail-folds-the-last-i-the-head-region-of-the-early-embryo-0-tongue-of-mesoblasl-cells-representing-the-urogenital-aniage-gt-megaspheres-in-process-of-passing-through-the-yolk-entoblast-fjc-body-cavity-c-points-in-extra-embryonic-region-where-the-ectode-RJ71X3.jpg ". Chimæroid fishes and their development. Fishes; Chimaeridae. DETAILS OF EARLY EMBRYO. 8l B n â¢â â -â V / »--Ws' â¢"If"/!' â "v n n. ^^ Figs. 71 A-E and continued F-l on page 82.âTransverse sections of late gastrula shown in Plate V, fig. 36. The sections pass forward ; the first of the series. A, traverses the tail folds; the last, I, the head region of the early embryo. 0» Tongue of mesoblasl cells representing the urogenital aniage; (>, megaspheres in process of passing through the yolk-entoblast; fjc, body cavity; c, points in extra-embryonic region where the ectode Stock Photo")
RMRJ71X3–. Chimæroid fishes and their development. Fishes; Chimaeridae. DETAILS OF EARLY EMBRYO. 8l B n â¢â â -â V / »--Ws' â¢"If"/!' â "v n n. ^^ Figs. 71 A-E and continued F-l on page 82.âTransverse sections of late gastrula shown in Plate V, fig. 36. The sections pass forward ; the first of the series. A, traverses the tail folds; the last, I, the head region of the early embryo. 0» Tongue of mesoblasl cells representing the urogenital aniage; (>, megaspheres in process of passing through the yolk-entoblast; fjc, body cavity; c, points in extra-embryonic region where the ectode
![. Carnegie Institution of Washington publication. DETAILS OF EARLY EMBRYO. 8l ( /^f B H n. be â w^. ^^Si X ^;JSS?> J^MXuJd '*^^'-''k -'"â '. "IsJ Figs. 71 A-E and continued F-I on page 82.âTransverse seclions of lale gastrula shown in Plate V, fig. 36. The sections pass forward ; the first of the series. A, traverses the tail folds; the last, I, the head region of the early embryo. «i ToDgue of mesoblast cells representing the urogenilal anlage; f>, megaspheres in process of passing through ihe yolk-entoblast; oc, body cavity; C, points in extra-embryonic region where the ec Stock Photo](https://c8.alamy.com/comp/RFR2HW/carnegie-institution-of-washington-publication-details-of-early-embryo-8l-f-b-h-n-be-w-si-x-jssgt-jmxujd-k-quot-quotisj-figs-71-a-e-and-continued-f-i-on-page-82transverse-seclions-of-lale-gastrula-shown-in-plate-v-fig-36-the-sections-pass-forward-the-first-of-the-series-a-traverses-the-tail-folds-the-last-i-the-head-region-of-the-early-embryo-i-todgue-of-mesoblast-cells-representing-the-urogenilal-anlage-fgt-megaspheres-in-process-of-passing-through-ihe-yolk-entoblast-oc-body-cavity-c-points-in-extra-embryonic-region-where-the-ec-RFR2HW.jpg ". Carnegie Institution of Washington publication. DETAILS OF EARLY EMBRYO. 8l ( /^f B H n. be â w^. ^^Si X ^;JSS?> J^MXuJd '*^^'-''k -'"â '. "IsJ Figs. 71 A-E and continued F-I on page 82.âTransverse seclions of lale gastrula shown in Plate V, fig. 36. The sections pass forward ; the first of the series. A, traverses the tail folds; the last, I, the head region of the early embryo. «i ToDgue of mesoblast cells representing the urogenilal anlage; f>, megaspheres in process of passing through ihe yolk-entoblast; oc, body cavity; C, points in extra-embryonic region where the ec Stock Photo")
RMRFR2HW–. Carnegie Institution of Washington publication. DETAILS OF EARLY EMBRYO. 8l ( /^f B H n. be â w^. ^^Si X ^;JSS?> J^MXuJd '*^^'-''k -'"â '. "IsJ Figs. 71 A-E and continued F-I on page 82.âTransverse seclions of lale gastrula shown in Plate V, fig. 36. The sections pass forward ; the first of the series. A, traverses the tail folds; the last, I, the head region of the early embryo. «i ToDgue of mesoblast cells representing the urogenilal anlage; f>, megaspheres in process of passing through ihe yolk-entoblast; oc, body cavity; C, points in extra-embryonic region where the ec
RM2AG54MM–. The science and practice of dental surgery. Trophobla&t. Amnioticectoderm. -j^— Ectomesoderm, -lA Embryonic entoderm..Extra-embryo-nic entoderm. Primarymesoderm. Amnion cavity. Primitivealimentary canalExtra-embryoniccoelom. D. plasmodial trophoblast. Cellular trophoblast.Amniotic ectoderm. Embryonicectomesoderm Embryonic entoderm. Extra-embryonicentoderm. Primary mesoderm. Plasmodial trophoblast. Cellular trophoblast. Amniotic ectoderm. Embryonicectomesoderm.i;inbryonic entoderm .Extra-embryonicentoderm. Primary mesoderm. Fig. 3.—Differentiation of the morula and theformation of the amnion,
RM2AWDJEB–The development of the human body; a manual of human embryology . ke place It is possible,therefore, to recognize two por-tions in the embryonic coelom, ananterior one, the parietal cavity(His), which is never connectedlaterally with the extra-embry-onic cavity, and a posterior one,the trunk cavity, which is so con-nected. The heart is situated inthe parietal cavity, a consider-able portion of which is destinedto become the pericardial cavity.Since the parietal cavity liesimmediately anterior to the stillwide yolk-stalk, as may be seenfrom the position of the heart inthe embryo shown in Fig. 4
RM2AJCFF0–A Reference handbook of the medical sciences embracing the entire range of scientific and practical medicine and allied science . artery and the aorta forms tlie duc-tus arteriosus, a veiy important fietal structure, as it en-ables the venous blood from the right side of the heart topass into the aorta without going through the lungs. Thegrowth of the liver has also been an important factor inbringing about modifications in the venous system. Withthe diminution of the umbilical vesicle the extra embry-onic portion of the omphalo-meseuterics disappears, butthe embryonic portions of the two vein
RM2ANJGK3–Veterinary obstetrics, including the diseases of breeding animals and of the new-born . Entoderm. Fig. 67. Transverse section of the embryonic area of a fourteen-and-a-half-dayovum of sheep. ( Heisler, after Bonnet). Amnion.. ileu roperica r-dial cavity. Fig. 68. Transverse section of a sixteen-and-a-half-day sheep-embryo.(Heisler, after Bonnet),day of gestation in the embryo of the .sheep and i.s soon complete.The date of its appearance in other domestic animals is approxi-mately the same. The amnion ari.ses from the extra-fetal portion of the somato-pleure, which folds upward around the marg
RM2CP5H98–. My life among the wild birds in Spain . the nest—Trees too large toswarm up—Value of pendent boughs in some cases—Tree climbing withropes—Use of light casting-line and lead—How to get a rope over ahigh bough—Ascending with the aid of a rope—Arrival at branches—Transition from rope work to climbing—Extra large trees—Climbing by successive stages with rope—Climbingirons—A nasty accident—Irons and ropean ideal plan—Dress for tree climbing—Uses of light line and fishing creel. HE art of tree climbing, for art it is,exists in an embryonic form in mostschoolboys. Most lads howeverdiscontinue the p
RMRCRJ38–. The development of the chick; an introduction to embryology. Birds -- Embryology. 146 THE DEVELOPMENT OF THE CHICK an inseparable union. As the extra-embryonic body-cavity extends, the allantois continues its expansion between the chorion and the yolk-sac, and finally wraps itself together with a duplica- tion of the chorion, completely around the albumen of the egg, which has become very viscid, and aggregated in a lump opposite to the embryo. The allantois is very vascular from the start, and serves as an embryonic organ of respiration. It also receives the excretion of the embryonic kidne
RMRCW8BC–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. 146 THE DEVELOPMENT OF THE CHICK an inseparable union. As the extra-embryonic body-cavity extends, the allantois continues its expansion between the chorion and the yolk-sac, and finally wraps itself together with a duplica- tion of the chorion, completely around the albumen of the egg, ivhich has become very viscid, and aggregated in a lump opposite %o the embryo. The allantois is very vascular from the start, and serves as an embryonic organ of respiration. It also receives the excretion of the e
RMRCRHX7–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. FROM TWELVE TO THIRTY-SIX SOMITES 131 chapter. The lateral limiting sulci are a continuation of the lateral limbs of the head-fold; they owe their origin to the folding of the splanchnopleure and somatopleure adjacent to the embryo towards the yolk, at the line of junction of embryonic and extra- embryonic parts. The tail-fold arises about the stage of 26 to 27 somites (Fig. 93), and is similar to the head-fold, except that it is turned in the opposite direction. The sulci combine to form a continu
RMRCW85G–. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. FORMATION OF THE GERM LAYERS 55 While these changes have been taking place a splitting of the enveloping layer has occurred, so that the wall of the ovum is now formed of three layers, an outer one which may be termed the trophoblast, a middle one which probably is transformed into the extra-embryonic mesoderm of later stages, though its significance is at present somewhat obscure, and an inner one which is the. Please note that these images are extracted from scanned page images that may hav
RMRCW8C5–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. 144 THE DEVELOPMENT OF THE CHICK arises from the neck of the allantois both behind and also at the sides, (cf. Fig. 82.) During the fourth day the distal portion of the allantois pushes out into the portion of the extra-embryonic body-cavity beneath the hind end of the embryo and rapidly expands to form a relatively large sac. But the neck of the allantois remains embedded in the ventral mesentery and does not expand; the terminal portion of the intestine has in the meantime formed Ect Sp/'p/.. Mes
RMRCW8FH–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. FROM TWELVE TO THIRTY-SIX SOMITES 135 vertebrate embryos; the cause appears to lie in the precocious development of the central nervous system, of which more here- after. Only the cranial flexure remains as a permanent con- dition. 11. Origin of the Embryonic Membranes The period from about 12 to 36 somites also includes the early history of the embryonic membranes, amnion, chorion, yolk-sac and allantois. The first three arise from the extra-embryonic blastoderm, and the allantois arises as an out
RMRCRJ64–. The development of the chick; an introduction to embryology. Birds -- Embryology. FRO:r TWELVE TO THIRTY-SIX SOMITES 131 chapter. The lateral limiting sulci are a continuation of the lateral limbs of the head-fold; they owe their origin to the folding of the splanchnopleure and somatopleure adjacent to the embryo towards the yolk, at the line of junction of embryonic and extra- embryonic parts. The tail-fold arises about the stage of 26 to 27 somites (Fig. 93), and is similar to the head-fold, except that it is turned in the opposite direction. The sulci combine to form a continuous ring ar
RMRCRJ3G–. The development of the chick; an introduction to embryology. Birds -- Embryology. 144 THE DEVELOPMENT OF THE CHICK arises from the neck of the allantois both behind and also at the sides, (cf. Fig. 82.) During the fourth day the distal portion of the allantois pushes out into the portion of the extra-embryonic body-cavity beneath the hind end of the embryo and rapidly expands to form a relatively large sac. But the neck of the allantois remains embedded in the ventral mesentery and does not expand; the terminal portion of the intestine has in the meantime formed Ect -3pl'pJ.. Mesam- Fig. 80.
RMRCRGW3–. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. THE PERITONEUM 323 'atxJidbJb 1 Cuw%ea£ 1 SaUai cavities is completed, and then the dorsal edge begins to descend more rapidly than the ventral, so that the diaphragm again becomes oblique in the same sense as in the beginning, a position which it retains in the adult. The Development of the Peritoneum.—The peritoneal cavity is developed from the trunk-cavity of early stages and is at first in free communication on all sides of the- yolk-stalk with the extra-embryonic ccelom. As the ventral w
RMRCTCAT–. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. U4 THE. ALLANTOIS AND BELLY-STALK maternal blood, instead of with the external atmosphere, as is the case in the egg-laying forms. Thus, the endodermal portion of the allantois, instead of arising from the intestine and pushing before it a layer of splanchnic mesoderm to form a large sac lying freely in the extra-embryonic portion of the body-cavity, appears in the human embryo before the intestine has differentiated from the yolk-sac and pushes its way into the solid mass of mesoderm which f
RMRCW8D8–. The development of the chick; an introduction to embryology. Birds -- Embryology. FROM TWELVE TO THIRTY-SIX SOMITES 183 VI. History of the Mesoderm The history of the extra-embryonic mesoderm is considered sufficiently in the first part of this chapter. The history of the embryonic mesoderm will be considered under the following heads: (1) Somites, (2) Intermediate Cell-mass, (3) Vascular System, (4) Lateral Plate and Body-Cavity, (5) Mesoblast of the Head.. 0tMj^jff§^3^:. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readabili
RMRC7NE8–. Embryology. Embryology; Embryology; genealogy. ENDODERM Fig. 172. Formation of the yolk sac, growth of the mesoderm, and differen- tiation of the trophoblast into the syntrophoblast and the chorion. MUSCLE LAYER O O O O O o- BLOOD VESSELS. CAVIT* or UTERUS Fig. 173. Primitive-streak stage of human embryo, together with the extra- embryonic membranes and the uterine wall. 268. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.
RMRCW839–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. FROM TWELVE TO THIRTY-SIX SOMITES 183 VI. History of the Mesoderm The history of the extra-embryonic mesoderm is considered sufficiently in the first part of this chapter. The history of the embryonic mesoderm will be considered under the following heads: (1) Somites, (2) Intermediate Cell-mass, (3) Vascular System, (4) Lateral Plate and Body-Cavity, (5) Mesoblast of the Head.. Fig. 105. — Embryo of about 27 somites drawn in alcohol by re- flected light; upper side, x 10. Am., Amnion, ot., Otocyst.
RMRCW82Y–. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. 68 THE MEDULLARY GROOVE of about 2.4 mm., while the corresponding size of the latter two was somewhat less than 4.0 mm. Notwithstanding the considerable increase in the size of these older ova, due to the continued increase in the size of the extra-embryonic ccelom, the embryos are but. Fig. 39.—The Embryo v. H. of von Spee. The Left Half of theT Chorion has been Removed to show the Embryo. a, Amniotic cavity; b, belly-stalk; ch, chorion; d, yolk-sac; e, extra-embryonic ccelom; ky embryonic d
RMRCW82M–. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. Fig. 39.—The Embryo v. H. of von Spee. The Left Half of theT Chorion has been Removed to show the Embryo. a, Amniotic cavity; b, belly-stalk; ch, chorion; d, yolk-sac; e, extra-embryonic ccelom; ky embryonic disk; 2, chorionic villus.—{vonSpee.) little advanced beyond the stage shown by the Peters embryo. The thickening of the chorionic mesoderm that encloses the amni- otic cavity has increased in size and now forms a pedicle, known as the belly-stalk (Fig. 39, 6), at the extremity of which i
RMRCTCTK–. The development of the albino rat, Mus norvegicus albinus. Embryology -- Mammals; Rats. .% £=; h-i -)t-- ex ict.. Fig. 10 Two egg cylinders of the albino rat found within the same decidual crypt, with in part common ectoplacental cone. X 150. Rat No. 87, 9 days after the beginning of insemination, eci.pl., ectoplacental cone or Triiger; p.cct., parietal or transitory ectoderm; r.ent., visceral entoderm; ex.ect., extra- embryonic ectoderm; /»â .(â ., proamniotic cavity; pr.emh.ect.. primary embryonic ectoderm; pr.emh.etit., primary embryonic entoderm; nies., mesoderm. 137. Please note that
![. A text-book of embryology for students of medicine [electronic resource]. Embryology; Embryology. TWO-LAYERED STAGE OF BLASTODERMIC VESICLE. 55 embryo, that is, it represents the embryonic ectoderm, while the enveloping layer would correspond to the extra-embry- i. onic ectoderm. Somewhat later the cystoblast in the vault of the amniotic cavity disappears and the lamina of cells re- ferred to above as forming the floor of the amniotic cavity. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance Stock Photo](https://c8.alamy.com/comp/RJNEWR/a-text-book-of-embryology-for-students-of-medicine-electronic-resource-embryology-embryology-two-layered-stage-of-blastodermic-vesicle-55-embryo-that-is-it-represents-the-embryonic-ectoderm-while-the-enveloping-layer-would-correspond-to-the-extra-embry-i-onic-ectoderm-somewhat-later-the-cystoblast-in-the-vault-of-the-amniotic-cavity-disappears-and-the-lamina-of-cells-re-ferred-to-above-as-forming-the-floor-of-the-amniotic-cavity-please-note-that-these-images-are-extracted-from-scanned-page-images-that-may-have-been-digitally-enhanced-for-readability-coloration-and-appearance-RJNEWR.jpg ". A text-book of embryology for students of medicine [electronic resource]. Embryology; Embryology. TWO-LAYERED STAGE OF BLASTODERMIC VESICLE. 55 embryo, that is, it represents the embryonic ectoderm, while the enveloping layer would correspond to the extra-embry- i. onic ectoderm. Somewhat later the cystoblast in the vault of the amniotic cavity disappears and the lamina of cells re- ferred to above as forming the floor of the amniotic cavity. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance Stock Photo")
RMRJNEWR–. A text-book of embryology for students of medicine [electronic resource]. Embryology; Embryology. TWO-LAYERED STAGE OF BLASTODERMIC VESICLE. 55 embryo, that is, it represents the embryonic ectoderm, while the enveloping layer would correspond to the extra-embry- i. onic ectoderm. Somewhat later the cystoblast in the vault of the amniotic cavity disappears and the lamina of cells re- ferred to above as forming the floor of the amniotic cavity. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance
RMRMKY62–. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 278 ANNALS OF THE SOUTH AFRICAN MUSEUM Conditions in living reptiles and mammals favour the assumption that the rods represent fossilized ceratohyals, for in both living groups an embryonic connexion exists between the ceratohyal and parts of the sound-conducting apparatus; in reptiles with the extra-columella and in mammals with the stapes. In Lacerta and many other lacertilians the ventrally projecting pars accessorius posterior (processus interhyalis) represents the stump of the ligament which con
![. A text-book of animal physiology [microform] : with introductory chapters on general biology and a full treatment of reproduction, for students of human and comparative (veterinary) medicine and of general biology. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. REPRODUCTION. 19 iterior part of the sterior end of the •ection, meets the ;h it fuses. t space (extra-em- a. the cleavage of 'T. ineden and Julin). Later blastoderm in front of the embryonic portion of the ion; am', portion of the talis; Av, area vasculosa; i>:ic portion of the body Stock Photo](https://c8.alamy.com/comp/RETHX5/a-text-book-of-animal-physiology-microform-with-introductory-chapters-on-general-biology-and-a-full-treatment-of-reproduction-for-students-of-human-and-comparative-veterinary-medicine-and-of-general-biology-physiology-comparative-veterinary-physiology-physiologie-compare-physiologie-vtrinaire-reproduction-19-iterior-part-of-the-sterior-end-of-the-ection-meets-the-h-it-fuses-t-space-extra-em-a-the-cleavage-of-t-ineden-and-julin-later-blastoderm-in-front-of-the-embryonic-portion-of-the-ion-am-portion-of-the-talis-av-area-vasculosa-igtic-portion-of-the-body-RETHX5.jpg ". A text-book of animal physiology [microform] : with introductory chapters on general biology and a full treatment of reproduction, for students of human and comparative (veterinary) medicine and of general biology. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. REPRODUCTION. 19 iterior part of the sterior end of the •ection, meets the ;h it fuses. t space (extra-em- a. the cleavage of 'T. ineden and Julin). Later blastoderm in front of the embryonic portion of the ion; am', portion of the talis; Av, area vasculosa; i>:ic portion of the body Stock Photo")
RMRETHX5–. A text-book of animal physiology [microform] : with introductory chapters on general biology and a full treatment of reproduction, for students of human and comparative (veterinary) medicine and of general biology. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. REPRODUCTION. 19 iterior part of the sterior end of the •ection, meets the ;h it fuses. t space (extra-em- a. the cleavage of 'T. ineden and Julin). Later blastoderm in front of the embryonic portion of the ion; am', portion of the talis; Av, area vasculosa; i>:ic portion of the body
![. A text-book of animal physiology [microform] : with introductory chapters on general biology and a full treatment of reproduction, for students of human and comparative (veterinary) medicine and of general biology. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. REPRODUCTION. 19 iterior part of the sterior end of the •ection, meets the ;h it fuses. t space (extra-em- a. the cleavage of 'T. ineden and Julin). Later blastoderm in front of the embryonic portion of the ion; am', portion of the talis; Av, area vasculosa; i>:ic portion of the body Stock Photo](https://c8.alamy.com/comp/RHY7JD/a-text-book-of-animal-physiology-microform-with-introductory-chapters-on-general-biology-and-a-full-treatment-of-reproduction-for-students-of-human-and-comparative-veterinary-medicine-and-of-general-biology-physiology-comparative-veterinary-physiology-physiologie-compare-physiologie-vtrinaire-reproduction-19-iterior-part-of-the-sterior-end-of-the-ection-meets-the-h-it-fuses-t-space-extra-em-a-the-cleavage-of-t-ineden-and-julin-later-blastoderm-in-front-of-the-embryonic-portion-of-the-ion-am-portion-of-the-talis-av-area-vasculosa-igtic-portion-of-the-body-RHY7JD.jpg ". A text-book of animal physiology [microform] : with introductory chapters on general biology and a full treatment of reproduction, for students of human and comparative (veterinary) medicine and of general biology. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. REPRODUCTION. 19 iterior part of the sterior end of the •ection, meets the ;h it fuses. t space (extra-em- a. the cleavage of 'T. ineden and Julin). Later blastoderm in front of the embryonic portion of the ion; am', portion of the talis; Av, area vasculosa; i>:ic portion of the body Stock Photo")
RMRHY7JD–. A text-book of animal physiology [microform] : with introductory chapters on general biology and a full treatment of reproduction, for students of human and comparative (veterinary) medicine and of general biology. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. REPRODUCTION. 19 iterior part of the sterior end of the •ection, meets the ;h it fuses. t space (extra-em- a. the cleavage of 'T. ineden and Julin). Later blastoderm in front of the embryonic portion of the ion; am', portion of the talis; Av, area vasculosa; i>:ic portion of the body
RMRDW9KT–. Plants; a text-book of botany. Botany. DIFFERENTIATION OF TISSUES 293 154. Roots.—True roots appear only in connection with the vascular plants (Pteridophytes and Spermatophytes) ; and in all of them the structure is essentially the same, and quite different from stem structure. A single ap- ical cell (in most Pteridophytes) (Fig. 274) or an apical group (in Spermatophytes) usually gives rise to the three embryonic regions — dermatogen, periblem, and plerome (I^ig-27o). A fourth region, how- . ^ P ^ ever, peculiar to root, is usually added. The apical. Please note that these images are extra
RMRD6K6X–. Cunningham's Text-book of anatomy. Anatomy. Xeuxal tube Ectoderm of amnion Mesoderm amnion Trophoblast of chorion Paraxial mesoderm Jntermediate cell tract Splanchnic and /somatic layers of lateral rjlate meso. Embryonic coelom Amnion Xeural crest Caudal neuropore. Xotochord Mesoderm of yolk-sac / Entoderm of yolk-sac -Amnion cavity N>Extra-em- bryonic ccelom Alimentary canal Yolk-sac Fig. 43. A. Diagram of a transverse section of a zygote, in which the neural tube has formed but has not separated from the surface ectoderm. B. Diagram of embryonic area of same zygote. Compare with surface
RMRHK6FX–. Biology of the laboratory mouse. Mice as laboratory animals; Mice; Animals, Laboratory; Mice. Notochord Ectoplacenta Chorion. Yolk-sac Amnion Amniotic cavity Extra-embryonic'coelom Neural groove Intra-embryonic coelom Fig. 19.—Frontal sections (X75) showing development of the yolk-sac. A. 7 days 6 hours. B. 7 days 10 hours. C. 8 days 10 hours, 9 somites, through 8th somite. Reichert's membrane omitted except in .. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may n
![. Chemical embryology. Embryology. SECT. 7] OF EMBRYONIC DEVELOPMENT 965 energy retained in a given amount of spatial intracellular and extra- cellular organisation. It is difficult to form a clear picture of this fraction of the energy. It is to be distinguished from Lapicque's 90000 80000 70000 60000 50000 40000 30000 20000 10000 gm. cals. .(iLjin). TANGLS Ea = 22940 cala. / CREa = 805cal8. , ^ SEa = 3600 cals.) Energy added to embryo b y coupled reactions etc. i.e. would have gone away as heat â¢'"â â¢â¢ othermic reacti{. Please note that these images are extracted from scanned page im Stock Photo](https://c8.alamy.com/comp/RJ8JC7/chemical-embryology-embryology-sect-7-of-embryonic-development-965-energy-retained-in-a-given-amount-of-spatial-intracellular-and-extra-cellular-organisation-it-is-difficult-to-form-a-clear-picture-of-this-fraction-of-the-energy-it-is-to-be-distinguished-from-lapicques-90000-80000-70000-60000-50000-40000-30000-20000-10000-gm-cals-iljin-tangls-ea-=-22940-cala-crea-=-805cal8-sea-=-3600-cals-energy-added-to-embryo-b-y-coupled-reactions-etc-ie-would-have-gone-away-as-heat-quot-othermic-reacti-please-note-that-these-images-are-extracted-from-scanned-page-im-RJ8JC7.jpg ". Chemical embryology. Embryology. SECT. 7] OF EMBRYONIC DEVELOPMENT 965 energy retained in a given amount of spatial intracellular and extra- cellular organisation. It is difficult to form a clear picture of this fraction of the energy. It is to be distinguished from Lapicque's 90000 80000 70000 60000 50000 40000 30000 20000 10000 gm. cals. .(iLjin). TANGLS Ea = 22940 cala. / CREa = 805cal8. , ^ SEa = 3600 cals.) Energy added to embryo b y coupled reactions etc. i.e. would have gone away as heat â¢'"â â¢â¢ othermic reacti{. Please note that these images are extracted from scanned page im Stock Photo")
RMRJ8JC7–. Chemical embryology. Embryology. SECT. 7] OF EMBRYONIC DEVELOPMENT 965 energy retained in a given amount of spatial intracellular and extra- cellular organisation. It is difficult to form a clear picture of this fraction of the energy. It is to be distinguished from Lapicque's 90000 80000 70000 60000 50000 40000 30000 20000 10000 gm. cals. .(iLjin). TANGLS Ea = 22940 cala. / CREa = 805cal8. , ^ SEa = 3600 cals.) Energy added to embryo b y coupled reactions etc. i.e. would have gone away as heat â¢'"â â¢â¢ othermic reacti{. Please note that these images are extracted from scanned page im
RMRHR9T0–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. j&. Kn.. s. I i;.j d tri.tis. Chromosome-groups of embryonic cells, a-h, 21- Miii-.'iiu' t p< ,1. b, c. d, e and/, from the same embryo; g and h, from anothrr i.. i. i ..ptional group with twenty-three chromosomes. in tin- immediate vicinity from which an extra chromo- i ould have been derived. The chromosome groups repre- iii Fii^. 8 and 9 were selected from a large number of. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration an
RMRGH6F1–. Bulletin of the Bureau of Fisheries. Fisheries; Fish culture. es. BAIRDIELLA CFIRYSURA. Fig. 9.—Egg showing later stage in differentia- tion of embryonic shield; qt, germ ring; es, embryonic shield. Fig. 10.—Egg showing embryonic shield (fs) with embryonic area i,ea) outlined; eea, extra-embry- onic area; gr, germ ring; i>p, posterior pole of blastoderm. outlined it is somewhat broader in the anterior or head region than in the posterior region. Observed in surface view (fig. 10) the embryonic area now has a more or less regular spatulate form. While the embryonic shield is growing forwa
RMRGD056–. Bulletin of the United States Fish Commission. Fisheries -- United States; Fish-culture -- United States. J>P BAIRDIELLA CHRYSURA. Fig. 9.âEgg showing later stage in differentia- tion of embryonic shield; qt, gerro ring; es, embryonic shield. Fig. 10.âEgg showing embryonic shield (ci) with embrj'onic area (fa) outlined; tea, extra-embry- onic area; gr, germ ring; pp, posterior pole of blastoderm. outlined it is somewhat broader in the anterior or head region than in the posterior region. Observed in surface view (fig. 10) the embryonic area now has a more or less regular spatulate form. W
RMRGH6ER–. Bulletin of the Bureau of Fisheries. Fisheries; Fish culture. BAIRDIELLA CFIRYSURA. Fig. 9.—Egg showing later stage in differentia- tion of embryonic shield; qt, germ ring; es, embryonic shield. Fig. 10.—Egg showing embryonic shield (fs) with embryonic area i,ea) outlined; eea, extra-embry- onic area; gr, germ ring; i>p, posterior pole of blastoderm. outlined it is somewhat broader in the anterior or head region than in the posterior region. Observed in surface view (fig. 10) the embryonic area now has a more or less regular spatulate form. While the embryonic shield is growing forward in
RMRGD05G–. Bulletin of the United States Fish Commission. Fisheries -- United States; Fish-culture -- United States. J>P BAIRDIELLA CHRYSURA. Fig. 9.—Egg showing later stage in differentia- tion of embryonic shield; qt, gerro ring; es, embryonic shield. Fig. 10.—Egg showing embryonic shield (ci) with embrj'onic area (fa) outlined; tea, extra-embry- onic area; gr, germ ring; pp, posterior pole of blastoderm. outlined it is somewhat broader in the anterior or head region than in the posterior region. Observed in surface view (fig. 10) the embryonic area now has a more or less regular spatulate form. W
RMREF8CT–. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. AREA 0 PAC A PE L LUCIDA EMBRYONIC SHIELD. MIDPRIMITIVE STREA ^^;t^. - PROAMNION ARE ,,'''hEAD PROCESS ,-i-J* INOTOCHORD) ..â¢^â -.y,. ,i^,'5iVv '1^ FMHRYONIC AREA LI:MS^k.i' -PRIMITIVE .^Mââ i-Ih/W^ EXTRA-EMBRYON .^^., ,. ^1 . ,9-p R I M I T I V E G R -'';''-,'^.' ^^ â â PRIMITIVE FO }'^l-^^.Miii^iai!^^^:i£i. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration
RMRDW5JF–. A manual of zoology. Zoology. '^^'>^nrr^' Fig. 582. Fig. .58,3. Fig. 582.—Shark embryo. (From Boas.) y, part of yolk sac ; y, external gills in front of pectoral flns. Fig. 583.—Embryonic envelopes of a mammal. (Diagram after Kolliker.) ah, amni- otic cavity ; al, allantois ; am, amnion ; f?(y, yolk stalk ; ri.s, yolk sac ; c, embryo : ft/i, ventral wall of embryo; r, extra-emVjryonic ccelom; sft, serosa; sz, serosal villi. amniotic fluid. The amnion is genetically a part of the ventral surface; it develops ventrally as folds—lateral, anterior, and pos- terior—which grow up over the back
RMRCRJ59–. The development of the chick; an introduction to embryology. Birds -- Embryology. FROM TWELVE TO THIRTY-SIX SOMITES 135 vertebrate embryos; the cause appears to lie in the precocious development of the central nervous system, of which more here- after. Only the cranial flexure remains as a permanent con- dition. II. Origix of the Embryonic Membranes The period from about 12 to 36 somites also includes the early history of the embryonic membranes, amnion, chorion, yolk-sac and allantois. The first three arise from the extra-embrvonic blastoderm, and the allantois arises as an outgrowth of the
Search Results for Extra embryonic Stock Photos and Images (199)
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