Bursa

Definition

A bursa is a small fluid-filled sac lined by synovial membrane with an inner capillary layer of viscous fluid. It acts as a cushion to reduce friction between tissues of the body, such as between tendons and bones near synovial joints.

Related terms

Synovial Joint: A type of joint that allows for smooth movement between bones, surrounded by a capsule filled with synovial fluid.

Tendon: A flexible but inelastic cord of strong fibrous collagen tissue attaching a muscle to a bone.

Synovial Fluid: A viscous, non-Newtonian fluid found in the cavities of synovial joints that reduces friction between the articular cartilage during movement