bursa

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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.
subacromial bursa one between the acromion and the insertion of the supraspinatus muscle, extending between the deltoid and the greater tubercle of the humerus. See illustration.
Subacromial bursa, lying between the acromion and supraspinatus tendon and extending between the deltoid and greater tubercle. From Dorland's, 2000.

bur·sa

, pl.

bur·sae

(ber'să, ber'sē), [TA]
A closed sac or envelope lined with synovial membrane and containing synovial fluid, usually found or formed in areas subject to friction (for example, over an exposed or prominent body part or where a tendon passes over a bone).
[Mediev. L., a purse]

bursa

(bûr′sə)
n. pl. bur·sae (-sē) or bur·sas
A sac or saclike bodily cavity, especially one containing a viscous lubricating fluid and located between a tendon and a bone or at points of friction between moving structures.

bur′sal adj.

bursa

A closed tissue space within a joint, which is lined by a synovial membrane, contains hyaluronic acid and lubricin-rich synovial fluid, and which serves as a gliding surface to reduce friction within a joint.

bur·sa

, pl. bursae (bŭr'să, -sē) [TA]
A closed sac or envelope lined with synovial membrane and containing synovial fluid, usually located or formed in areas subject to friction (e.g., over an exposed or prominent part or where a tendon passes over a bone).
[Mediev. L., a purse]

bursa

A small fibrous sac lined with a membrane which secretes a lubricating fluid (synovial membrane). Bursas are efficient protective and friction-reducing structures and occur around joints and in areas where tendons pass over bones.
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