The rotator cuff is a group of four tendons and their related
muscles that cover the shoulder joint. The rotator cuff helps
keep the shoulder stable and allows the arm to rotate or move
up, down, in, and out. Tendons are tough, ropelike fibers that
connect muscles to bones. The rotator cuff muscles are called
the supraspinatus, infraspinatus, subscapularis, and teres
minor. Tendons connect the rotator cuff muscles, which start at
the shoulder blade (scapula), to the upper arm bone (humerus).
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