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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.
See also: cuff. four muscles (supraspinatus, subscapularis, infraspinatus and teres minor), which act in synergy at the shoulder joint to facilitate movement and provide stability by maintaining the head of the humerus in the glenoid cavity.