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Rotator Cuff
The rotator cuff is four muscles that originate on the scapula, and insert into the proximal humerus. The form a "cuff" of tendinous tissue that circumferentially surrounds about 3/4ths of the circumference of the glenohumeral joint when viewed from the lateral aspect. These muscles internally and externally rotate the humeral head (hence the name "Rotator Cuff"), and also help initiate abduction. Another very important function is to stabilize the humeral head in the glenoid when other muscles are acting to move the humerus.
See image above.
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