Bursa of Fabricius

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bursa of Fabricius

[′bər·sə əv fə′brēsh·əs]
(vertebrate zoology)
A thymus-like organ in the form of a diverticulum at the lower end of the alimentary canal in birds.

Bursa of Fabricius


(named after G. Fabricius), a pouchlike thick-walled formation in birds, situated on the dorsal surface of the rear section of the cloaca. The bursa of Fabricius is well developed in all young birds until they reach sexual maturity, at about eight or nine months, when it becomes reduced. Rheas are the only birds in which it does not become reduced. The function of the bursa of Fabricius has not been clearly established; lymphatic cells and oxyphile leucocytes are formed inside it.

References in periodicals archive ?
Histologic lesions in the bursa of Fabricius and results of polymerase chain reaction (PCR) assay for pigeon circovirus (PiCV) in naturally infected pigeons.
Atrophy of the primary lymphoid organs of meat pigeons in Italy associated with circovirus like particles in the bursa of Fabricius.
An obvious bursa of Fabricius was identified, and a biopsy was done in 28 (39%) of 71 pigeons.
The bursa of Fabricius can be visualized in the dorsal wall of the urodeum just caudal to the urodeal fold.
Starting from the coprodeum, the telescope was slowly withdrawn, and once the urodeal fold was visualized, the dorsal urodeal wall was examined for the bursa of Fabricius.
The bursa of fabricius has been suggested to be the primary site of immunoglobulin synthesis (Glick, 1977).
Seven euthanized birds per group were dissected to collect the spleen, bursa of Fabricius and thymus, which were then weighed immediately.
However, the indices of spleen, thymus and bursa of Fabricius were significantly improved by supplementation with 100 mg/kg COS compared with the control and CTC treatments (p< 0.
The main immune organs such as thymus, spleen and bursa of Fabricius in avian species perform greatly significant roles in immunity of animals, including the main local sites for the maturation, differentiation and proliferation of lymphocytes.

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