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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.
The bursa is a fluid filled sack located between the acromion bone and supraspinatus tendon. This bursa can becomes inflamed, swollen and scarred in chronic rotator cuff conditions. As with tendonitis, however, the bursa is frequently not found to be significantly inflamed in most cases of rotator cuff tendinosis.