The rotator cuff is a group of four muscles and their tendons that surround the shoulder joint. It connects the shoulder blade (scapula) to the upper arm bone (humerus), forming a cuff around the head of the humerus within the shallow socket of the shoulder joint (glenoid fossa). This structure stabilizes the shoulder by holding the humeral head firmly in place while allowing a wide range of motion, including arm abduction and rotation

. The four muscles making up the rotator cuff are:

• Supraspinatus
• Infraspinatus
• Teres minor
• Subscapularis

These muscles originate from different parts of the scapula and insert on the humerus, with their tendons converging to form the rotator cuff tendon that covers the shoulder joint

. In summary, the rotator cuff is located around the shoulder joint, specifically between the scapula and the humerus, providing both stability and mobility to the shoulder