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burÂ·sa faÂ·briÂ·c'iÂ·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. Lymphoid tissue at the junction of the cloaca and the gut in birds, which gives rise to B lymphocytes.arge bursa on the summit of the calcaneus where the superficial digital flexor muscle tendon is partly inserted as it passes distally to the foot; in the horse there may be an additional small subcutaneous bursa over the tendon at this site; its inflammation causes 'capped hock'. cloacal bursa. bursa of Fabricius.
Abstract. The bursa of Fabricius plays a central role in the development of the antibodyâproducing Bâlymphocyte lineage in birds. It consists of more than 10â000 follicles surrounded by connective tissue. These follicles provide an appropriate microenvironment for generating a primary repertoire of antibodies.natomy and structure of the avian bursa of Fabricius. (a) Anatomical location of the chicken thymus and the bursa of Fabricius, and a crossâsection of the bursa of Fabricius.