Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia.
bursa[bur´sah] (pl. bur´sae) (L.)
a small fluid-filled sac or saclike cavity situated in places in tissues where friction would otherwise occur. adj., adj bur´sal. Bursae function to facilitate the gliding of muscles or tendons over bony or ligamentous surfaces. They are numerous and are found throughout the body; the most important are located at the shoulder, elbow, knee, and hip. Inflammation of a bursa is known as bursitis.
bursa of Fabricius an epithelial outgrowth of the cloaca in chick embryos, which develops in a manner similar to that of the thymus in mammals, atrophying after 5 or 6 months and persisting as a fibrous remnant in sexually mature birds. It contains lymphoid follicles, and before involution is a site of formation of B-lymphocytes associated with humoral immunity.
bursa muco´sa (mucous bursa) (synovial bursa) a closed synovial sac interposed between surfaces that glide upon each other; it may be subcutaneous, submuscular, subfascial, or subtendinous in location.
a sac containing synovial fluid that occurs at sites of friction, as between a tendon and a bone over which it plays, or subcutaneously over a bony prominence. Terminologia Anatomica lists the following types: subcutaneous bursa, bursa subcutanea [TA]; submuscular bursa, bursa submuscularis [TA]; subfascial bursa, bursa subfascialis [TA]; and subtendinous bursa, bursa subtendinea [TA].
syn·o·vi·al bur·sa(si-nō'vē-ăl bŭr'să) [TA]
A sac containing synovial fluid that occurs at sites of friction, as between a tendon and a bone over which it plays, or subcutaneously over a bony prominence.