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Supraspinatus Muscle: Anatomy, Function, Clinical Significance, and Rehabilitation Introduction The supraspinatus muscle is one of the four rotator cuff muscles of the shoulder. Despite its relatively small size, it plays a significant role in both shoulder movement and stability. It is particularly important in initiating arm abduction and maintaining the humeral head’s position in the glenoid cavity. Due to its location beneath the acromion, the supraspinatus is highly susceptible to overuse injuries, impingement, and degenerative changes, especially in individuals performing repetitive overhead movements such as athletes, manual laborers, and certain occupational workers. Anatomy Origin Supraspinous fossa of the scapula. Insertion Superior facet of the greater tubercle of the humerus. Nerve Supply Suprascapular nerve (C5, C6), derived from the upper trunk of the brachial plexus. Blood Supply Suprascapular artery (branch of the thyrocervical trunk). ...