does The rotator cuff muscles act to stabilize the humerus
From Wikipedia, the free encyclopedia. In anatomy, the rotator cuff (sometimes incorrectly called a rotator cup, rotor cuff, or rotary cup) is a group of muscles and their tendons that act to stabilize the shoulder.The four muscles of the rotator cuff are over half of the seven scapulohumeral muscles.he tendons at the ends of the rotator cuff muscles can become torn, leading to pain and restricted movement of the arm. A torn rotator cuff can occur following a trauma to the shoulder or it can occur through the wear and tear on tendons, most commonly the supraspinatus tendon found under the acromion.