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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.
There are four muscle groups in the shoulder: 1  The rotator cuff muscles are the subscapularis, the supraspinatus, the infraspinatus, and the teres minor. 2  The biceps tendon complex also helps keep the humeral head in the glenoid and helps raise the arm. 3  The scapulothoracic muscles attach the scapula to the thorax.