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Your rotator cuff is made up of muscles and tendons that keep the ball (head) of your upper-arm bone (humerus) in your shoulder socket. It also helps you raise and rotate your arm.
Shoulder Anatomy: The Rotator Cuff . The rotator cuff refers to a group of four tendons and muscles that form a "cuff" to stabilize the shoulder joint and keep the arm in the shoulder socket, while allowing it to move in different directions. The shoulder joint is stable because of the rotator cuff, but it is also relatively weak.
The supraspinatus is the most frequently torn of all the rotator cuff tendons. It is the uppermost muscle of the rotator cuff and is located at the back of your shoulder blade. It passes beneath the acromion and runs towards the greater tubercle at the top of your humerus joining at the top of the cuff by the supraspinatus tendon.
Anatomy of the Rotator Cuff. The rotator cuff is important for normal shoulder function. The shoulder blade is attached to the chest wall by additional muscles. As a result, the rotator cuff indirectly connects the arm to the chest wall through its attachments to the shoulder blade. When the muscles that make up the rotator cuff shorten,...
The rotator cuff attaches the humerus to the shoulder blade and helps to lift and rotate your arm. Between the rotator cuff and the bone on top of your shoulder (acromion) is a lubricating sac (bursa). The bursa allows the rotator cuff tendons to glide smoothly during movement.
An animated description of the anatomy and treatment of rotator cuff tears.