- Human pathology

Home > E. Pathology by systems > Locomotory system > Joints > Bursa > bursa


Tuesday 4 April 2017

synovial bursa


Definition: A bursa (plural bursae or bursas) is a small fluid-filled sac lined by synovial membrane with an inner capillary layer of viscous synovial fluid (similar in consistency to that of a raw egg white). 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. Bursae are found around most major joints of the body.


There are four types of bursa :
- adventitious bursa
- subcutaneous bursa
- synovial bursa
- sub-muscular bursa

Among these, only adventitious is non-native.

When any surface of the body is subjected to repeated stress, an adventitious bursa develops under it. Examples are student elbow and bunion.


The general term for disease of bursae is "bursopathy."

Infection or irritation of a bursa leads to bursitis (inflammation of a bursa).

- bursitis