how does the rotator cuff function
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.
The rotator cuff muscles are important in shoulder movements and in maintaining glenohumeral joint (shoulder joint) stability. These muscles arise from the scapula and connect to the head of the humerus, forming a cuff at the shoulder joint.