Synovial bursa

"Bursae" redirects here. For other uses, see Bursa (disambiguation).

A synovial bursa, usually simply bursa (pl.: 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.

Synovial bursa
Typical joint
Within the knee joint: bursae visible top right, middle right and bottom right
Details
Identifiers
Latin	bursa synovialis
MeSH	D002061
TA98	A03.0.00.039
TA2	2028, 2027
TH	H3.03.00.0.00039
FMA	9692
Anatomical terminology

Structure

Based on location, there are three types of bursa: subcutaneous, submuscular and subtendinous. A subcutaneous bursa is located between the skin and an underlying bone. It allows skin to move smoothly over the bone. Examples include the prepatellar bursa located over the kneecap and the olecranon bursa at the tip of the elbow. A submuscular bursa is found between a muscle and an underlying bone, or between adjacent muscles. These prevent rubbing of the muscle during movements. A large submuscular bursa, the trochanteric bursa, is found at the lateral hip, between the greater trochanter of the femur and the overlying gluteus maximus muscle. A subtendinous bursa is found between a tendon and a bone. Examples include the subacromial bursa that protects the tendon of shoulder muscle as it passes under the acromion of the scapula, and the suprapatellar bursa that separates the tendon of the large anterior thigh muscle from the distal femur just above the knee.

An adventitious bursa is a non-native bursa. When any surface of the body is subjected to repeated stress, an adventitious bursa develops under it. Examples are student's elbow and bunion.

Clinical significance

Infection or irritation of a bursa leads to bursitis (inflammation of a bursa). The general term for disease of bursae is "bursopathy."

Etymology

Bursa is Medieval Latin for "purse", so named for the bag-like function of an anatomical bursa. Bursae or bursas is its plural form.

See also

• Bursa of Fabricius (a lymphatic organ in birds)
• Bursectomy
• Knee bursae
• Shoulder joint#Bursae

External links

• Hirji, Zameer; Hunjun, Jaspal S; Choudur, Hema N (2 May 2011). "Imaging of the Bursae". Journal of Clinical Imaging Science. 1: 22. doi:10.4103/2156-7514.80374. PMC 3177464. PMID 21966619.
• Bursa
• Diagram of elbow with olecranon bursa

Source text

 This article incorporates text from a free content work. Licensed under CC BY 4.0. Text taken from Anatomy and Physiology​, J. Gordon Betts et al, Openstax.