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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.
Muscle, infraspinatus: A muscle that assists the lifting of the arm while turning the arm outward (external rotation). The tendon of the infraspinatus muscle is one of four tendons that stabilize the shoulder joint and constitute the rotator cuff.Each of the four tendons that makes up the rotator cuff hooks up to a muscle that moves the shoulder in a specific direction. The infraspinatus muscle; 2  The teres minor muscle, which (like the infraspinatus muscle) helps in the outward turning (external rotation) of the arm; 3  The supraspinatus muscle, which is responsible for elevating the arm and moving it away from the body; and.