Also found in: Dictionary, Thesaurus, Encyclopedia.


 [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.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.


Plural of bursa.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012


A closed sac lined with a synovial membrane and filled with fluid, usually found in areas subject to friction, such as where a tendon passes over a bone.
Mentioned in: Joint Fluid Analysis
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Caption: Of the two major bursae in the hip, the trochanteric bursa is most likely to become inflamed.
Papillae anales slightly narrow with some short satae; apophyses posteriores very slender, apophyses posteriores 2.02 times longer than apophyses anteriores; apophyses anteriores relatively thick; antrum well developed; ductus bursae narrow and relatively short; corpus bursae slightly long.
As shown in [Table 1], the most common finding was a fluid-filled bursae surrounding the knee.
Whether Trueperella bernardiae may preferentially infect joints or bursae affected by crystalline arthropathies is not clear, but this patient's clinical symptoms and signs improved dramatically with operative debridement and appropriate antibiotic therapy without nonsteroidal anti-inflammatory or corticosteroid therapy, supporting the pathogenic role of Trueperella bernardiae in this case.
Bursae close to the surface of the skin are most likely to get infected.
These isolates were isolated from infected bursae that were ground, centrifuged, and filtered through a 0.2 [micro]m filter (Millipore, Merck).
Olga Bursae, VP sales, said, "Deco is key on top of clear weighty bottles." Beautiful flacons at Bormioli's booth included the sculptural, footless bottle for CK2 and the texturally appealing Gucci Bamboo.
Traumatic causes include ACL injuries, that is tearing of the anterior cruciate ligament (ACL), ligaments that connect the shinbone to the thighbone; meniscal injuries or tear in the knee while bearing weight; fractures, and knee bursitis, ie inflammation in the bursae or the small sacs of fluid that cushion the outside of the knee joint.
[1-4] GCT-TS is adjudged the extra-articular equivalent of pigmented villonodular synovitis, emerging from the tendon sheaths, bursae, or ligaments.
Las especies analizadas forman un grupo monofiletico (95% apoyo "bootstrap"), sustentado por siete sinapomorfias (Tabla 1); estas son: 2(1) presencia de un lobulo entre la costa y vena [M.sub.3] en el ala anterior de la hembra; 10(1) region media del gnathos densamente espinosa; 14(1) anellus armado con microespinas; 16(1) anellus esclerosado y con forma de tridente; 17(1) anellus unido a una membrana esclerosada; 21(1) signum ausente; 23(1) corpus bursae globoso.
(11) Gordon thought adjacent bursae were involved secondarily, analogous to bursitis and tendinitis of the shoulder.