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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.
Arm Flexion and Medial Rotation. The anterior part of the deltoid works with other shoulder and arm muscles to medially rotate and flex the arm. The arm rotates medially when you turn the front of the arm bone toward your body, and you flex your arm when you raise it up to the front of your body.