![]() ![]() ![]() This tubercle is just behind the head of the humerus. Its fibers merge into a tendon that crosses the joint to insert on the greater tubercle of the humerus. Another of the rotator cuff muscles it arises from the top of the scapula, the area above the spine. The supraspinatus muscle assists in lifting the arm outward abduction. It arises from two bones and three places: from the lateral third of the clavicle, from the acromion, and from the spine of the scapula. The fibers cover the shoulder joint to merge as a small tendon which inserts onto the deltoid tuberosity, a small projection on the lateral aspect of the shaft of the humerus, about midway down. This thick muscle covers the shoulder protecting the joint. It assists in many movements of the arm, moving it forward, backward, and outward abduction. Upward rotation: trapezius, serratus anterior True abduction: supraspinatus (first 15 degrees), deltoid
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