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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.
subcutaneous infrapatellar bursa: between the skin and tibial tuberosity; deep infrapatellar bursa: between patella ligament and upper tibia; Two bursae are located laterally: between the lateral collateral ligament and the biceps femoris tendon; between the lateral collateral ligament and the capsule where it overlies the popliteus muscle; Two bursae are located medially: between the medial collateral ligament and the pes anserinus; between the medial collateral ligament and the capsule, tibia and semimembranosus tendon; There are four bursae posterior to the knee joint: 1  between the capsule and medial head of gastrocnemius; communicates with the synovial cavity. 2  semimembranosus bursa: between semimembranosus and the medial head of gastrocnemius; may communicate with the bursa under the medial head of the gastrocnemius and thereby the synovial cavity.