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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.
Anatomy: Four muscles are part of the rotator cuff surrounding the shoulder joint, and controls, coordinates and assists movement of the shoulder: M infraspinatus (the lower shoulder blade muscle), M supraspinatus, M subscapularis and M teres minor. The infraspinatus muscle rotates the arm outwards. Acromion.