The supraspinatus is a relatively small muscle of the upper back that runs from the supraspinatus fossa superior portion of the scapula (shoulder blade) to the greater tubercle of the humerus. It is one of the four rotator cuff muscles and therefore helps to stabilize the glenohumeral joint, it also abducts the arm at the shoulder. The spine of the scapula separates the supraspinatus muscle from the infraspinatus muscle, which originates below the spine.
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