the rotator cuff

In the human body, the rotator cuff is a functional anatomical unit located in the upper extremity.
Its function is related to the glenohumeral joint, where the muscles of the cuff function both as the executors of the movements of the joint and the stabilisation of the joint as well.
Injuries of the rotator cuff interfere with the function of the glenohumeral joint and correspond with inability to perform the movements associated with this joint.
Supraspinatus muscle Origin: supraspinatous fossa of scapula
Insertion: greater tubercle of humerus
Innervation: suprascapular nerve (C4, C6)
Function: initiation of abduction of arm to 15° at glenohumeral joint; stabilisation of humeral head in glenoid cavity.