The rotator cuff tendons provide stability to the shoulder; the muscles allow the shoulder to rotate working in tandem with the major muscles such as deltoid.

The muscles in the rotator cuff include:

• Teres minor
• Infraspinatus
• Supraspinatus
• Subscapularis

Each muscle of the rotator cuff originates from the shoulder blade and has a tendon that attaches to the humerus. Together, the tendons and other tissues form a cuff around the humerus(Next to ball part of arm bone).