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The prime mover for flexion of the shoulder muscles used are the following: 1  Pectoralis Major Clavicle. 2  Anterior Deltoid. 3  Biceps Brachii Short Head. 4  Coracobrachialis.
Their tendons wrap around the head of the humerus, blending with the connective tissues around the joint. The rotator cuff muscles stabilize the shoulder joint by pulling the head of the humerus into the shoulder socket. One of them, the supraspinatus, helps the lateral deltoid abduct the arm.