bursa of Fabricius

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 [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.

bur·sa fa·bri·c'i·i

the bursa of Fabricius in poultry, a blind saclike structure located on the posterodorsal wall of the cloaca; it performs a thymuslike function.
Synonym(s): bursa of Fabricius
Farlex Partner Medical Dictionary © Farlex 2012

bursa of Fabricius

(fə-brĭsh′ē-əs, -brĭsh′əs)
A lymphoid gland in birds that is connected to the cloaca and is the site of B cell maturation.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

bursa of Fabricius

Lymphoid tissue at the junction of the cloaca and the gut in birds, which gives rise to B lymphocytes.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

bursa of Fabricius

An organ in the cloacal-hind gut junction birds found to be important in the maturation of B lymphocytes (B for bursa). The equivalent in humans is probably the tonsils or lymphoid tissue in the intestine.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005


Girolamo (Hieronymus ab Aquapendente), Italian anatomist and embryologist, 1537-1619.
bursa fabricii - in poultry, a blind saclike structure located on the posterodorsal wall of the cloaca. Synonym(s): bursa of Fabricius
bursa of Fabricius - Synonym(s): bursa fabricii
Fabricius ship - the outlines of the sphenoid, occipital, and frontal bones, from their fancied resemblance to the hull of a ship.
Medical Eponyms © Farlex 2012
References in periodicals archive ?
The bursa of fabricius is a lymphoid tissue that is absent in the immune system of mammals, as a consequence of the species' evolution (figure 1) (BOEHM et al., 2012).
Moreover, some lesions appeared (3/3) in the kidney, and also (1/3) in the bursa of Fabricius, liver, and lung.
Gross Bursal lesions scores in bursa of Fabricius of various groups.
The bursa of Fabricius, with many B cells, is one of essential immune organs [4].
Analysis of the tissue distribution of goose IFITM1 and IFITM3 in geese showed that both goose IFITM1 and IFITM3 were readily detected in some immune-related tissues, including the thymus, bursa of Fabricius, and Harderian gland.
Table 1: Virus antigen detection by agar gel precipitation test in bursa of Fabricius collected from field outbreaks and experimental chicks.
In the results of exposure to extreme heat stress along with the continuous lighting, it was observed that serum IgG, lymphoid organs, bursa of Fabricius, thymus and
Scoring Microscopic Lesions in the Bursa of Fabricius, Thymus, Spleen, and Kidney in Gnotobiotic and Battery Reared White Leghorns Experimentally Infected with Infectious Bursal Disease Virus.
** Bursal Weight Index is the weight of Bursa of Fabricius divided by the live weight of the bird x 100 *** Feed conversion is the weight of consumed feed divided by the live weight of the bird.
We obtained information on the size of bursa of Fabricius and spleen from postmortem examinations of dead birds brought to a taxidermist (J.E.).

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