Rotator cuff

It is a fibrous sheath formed by four tendons which strengthens the capsule of shoulder joint from all sides except inferiorly. 

Rotator cuff muscles also stabilises humeral head to keep it in its position so there is stable range of motion of shoulder joint.

Note :- As the rotator cuff muscles doesn't strengthens the capsule joint from inferior side so dislocation of the humerus occurs most commonly in a downward direction.

Origin and insertion of rotator cuff muscles.

Muscles of rotator cuff muscle arises from scapula and are inserted into lesser and greater tubercle of humerus.

 Rotator cuff muscles name -

1. Subscapularis

2. Supraspinatus

3. Infraspinatus

4. Teres minor

Clinical - 

1. Rotator Cuff Tear - 

Tearing of the muscles or tendons of rotator cuff.

2. Rotator Cuff Tendinitis - 

Acute inflammation of the tendons of rotator cuff.

3. Rotator Cuff Tendinopathy -

Chronic degeneration of the rotator cuff tissue.

4. Impingement syndrome -

Biomechanical dysfunction of the shoulder complex with causes abnormal wear and tear on the rotator cuff soft tissue.

5. Bursitis -

Inflammation of the bursa around the rotator cuff muscle.