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Subacromial bursa

Recommended video: Shoulder joint [22:04]
Bones, ligaments, muscles and movements of the shoulder joint.

The subacromial bursa is the largest of the bursae of the glenohumeral (shoulder) joint. Bursae are sacs filled with synovial fluid secreted by synovial membrane commonly found around synovial joints. The subacromial bursa is located inferior to the acromion process of the scapula and the coracoacromial ligament and superior to the joint capsule and supraspinatus tendon. It does not normally communicate with the glenohumeral joint cavity.

Laterally, it extends to lie deep to the deltoid muscle, with this portion commonly called the subdeltoid bursa. Together the subacromial and subdeltoid bursae function to reduce friction around the shoulder joint, protect the joint capsule and prevent wear and tear of the supraspinatus tendon particularly during abduction of the arm. 

Terminology English: Subacromial bursa
Latin: Bursa subacromialis
Definition Large bursa of the shoulder joint, between the acromion and coracoacromial ligament superiorly and the joint capsule and tendon of the supraspinatus inferiorly
Function Prevent friction, protect joint capsule and prevent wear and tear of supraspinatus tendon

Learn more about the structures of the shoulder joint with this study unit (and article):

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