Connective tissue surrounding a synovial joint and containing synovial fluid (see figure below for further details).
A typical joint capsule. Hyaline cartilage is a semi-transparent cartilage with a blue tint, consisting of cells that synthesize a surrounding matrix of hyaluronic acid (a viscous mucopolysaccharide), collagen (a fibrous protein that makes up tough connective tissues such as cartilages, ligaments and tendons) and other proteins. It forms most of the fetal skeleton, and is found in the joint surfaces of the adult, but also in the trachea and larynx. Synovial membrane is a thin membrane in freely moving (synovial) joints that lines the cavities of the joint capsule and secretes synovial fluid. Synovial fluid (also called synovium) is the viscid fluid found in joints (and tendon sheaths) that is contained within a membrane, which lubricates the joints and allows fluent pain-free pain movement.
See Collagen, Diathrodial joints, Endochondrial ossification, Epiphysis, Larynx, Musculoskeletal system