File:On the anatomy of vertebrates (electronic resource) (1866) (14564321129).jpg

Identifier: b20416039_003 (find matches)
Title: On the anatomy of vertebrates (electronic resource)
Year: 1866 (1860s)
Authors: Owen, Richard, 1804-1892
Subjects: Anatomy, Comparative Vertebrates Fishes Reptiles Mammals Birds
Publisher: London : Longmans, Green
Contributing Library: Wellcome Library
Digitizing Sponsor: Wellcome Library

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in the Mar-supial than in any otherMammal. It swells out im-mediately beyond the neckof the bladder, and thengradually tapers to its junc-tion with the spongy partof the urethra. Its wallsare thick, formed by an ex-ternal thin stratum of nearlytransverse muscular fibres,and by a thick glandularlayer, the secretion of whichexudes by innumerable poresupon the lining membraneof this part of the urethra.In a male Kangaroo I foundthat a glairy mucus followedcompression of this musculo-prostatic tract of the ure-thra : the canal itself is butslightly dilated. Three pairsof Cowperian glands, ib. c,c, c, pour their secretioninto the bulbous part of theurethra: the upper or proxi-mal pair are not half thesize of the two other pairsin the Kangaroo, but arerelatively larger in theKoala and other Marsu-pials: the two lower pairs are situated, one on each side thelateral division, e, e, of the bulb of the urethra; their ducts meetand join, above this part, with the duct of the smaller gland : each
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Hypsiprymvus. Male organs.B, Phascolarctus. MALE ORGANS OF MARSUPIALS. gland is enclosed by a muscular capsule. The penis consists ofa cavernous and a spongy portion, each of which commences bytwo distinct bodies. The separate origin of each lateral half ofthe spongy body constitutes a double bulb of the urethra, ib. e, e,and the 6 accelerator urinae, as it is termed, undergoes a similardivision into two separate muscles, each of which is appropriatedto compress its particular bulb. The two bulbous processes ofthe corpus spongiosum soon unite to surround the urethra, butagain bifurcate to form a double glans penis in the multiparousMarsupials, in which most of the ova are impregnated in bothovaria, as e.g. in the Phalangers, Perameles, Opossums, &c, b, b,fig. 504. In the uniparous Marsupials, as the Kangaroo, theglans penis, fig. 503, f, is single. The intermediate structures of the glans between the two ex-tremes above instanced are presented by the Ursine Dasyure,Koala, and Womb

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