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A bursa (plural: bursae) is a small fluid-filled sac lined by a synovial membrane with an inner capillary layer of synovial fluid. These provide a cushion between bones and tendons and/or muscles around a joint. This helps to reduce friction between the bones and allows free movement. Bursae may or may not communicate with the joint space.
According to location
According to etiology
deep bursae: present from birth
superficial bursae: form shortly after birth
adventitial bursae: acquired due to friction