Supraspinatus Under the Skin

Description

Beneath the posterior skin envelope of the male shoulder girdle, the supraspinatus occupies the supraspinous fossa superior to the scapular spine, its muscle belly running laterally under the acromion toward the proximal humerus. Fibers converge into a tendon that passes deep to the deltoid and coracoacromial arch to insert on the superior facet of the greater tubercle, blending with the superior capsule of the glenohumeral joint. Medial to lateral, the muscle tracks from the scapular medial border toward the humeral head, with the deltoid sitting superficially and the trapezius region implied superiorly along the posterior midline landmarks. For teaching the rotator cuff, this posterior relationship matters because the supraspinatus is the cuff component most often involved in degenerative tearing and subacromial impingement, where the tendon’s course beneath the acromion predisposes it to abrasion and hypovascular wear near its insertion. This is the anatomy surgeons reference when planning arthroscopic repair, acromioplasty, or when explaining why pain localizes to the lateral shoulder even though pathology sits deep at the greater tubercle. A small muscle. A common problem. Use this asset in musculoskeletal anatomy modules covering the scapulohumeral rhythm, in sports medicine and orthopedics content on rotator cuff tendinopathy and tears, or in patient education materials that need a clean posterior map from scapular fossa to humeral insertion under the deltoid. It also supports clinical correlation alongside MRI or ultrasound discussions by clarifying the tendon’s subacromial passage and its relationship to the deltoid-splitting approach. Anatomical accuracy verified by SciePro's Medical Advisory Board.