Bursae are small fluid-filled sacs lined by a synovial membrane with an inner capillary layer of synovial fluid. It provides a cushion between bones and tendons and/or muscles around a joint. This helps to reduce friction between the bones and allows free movement. They may or may not communicate with the joint space.
Examples
According to location
According to etiology
- deep bursae: present from birth
- superficial bursae: form shortly after birth
- adventitial bursae: acquired due to friction
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