The rotator cuff is a group of tendons and muscles in the shoulder, connecting the upper arm (humerus) to the shoulder blade (scapula). The rotator cuff tendons provide stability to the shoulder; the muscles allow the shoulder to rotate.

The muscles in the rotator cuff include:

• Teres minor

• Infraspinatus

• Supraspinatus

• Subscapularis

Each muscle of the rotator cuff inserts at the scapula, and has a tendon that attaches to the humerus. Together, the tendons and other tissues form a cuff around the humerus.

Reference:

http://www.webmd.com/pain-management/picture-of-the-rotator-cuff

Picture: Google images