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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.
When flexed the Latissimus Dorsi Muscle achieves movement of the arm in three different ways; 1 Extension: The shoulders are opened which results in the movement of the arm in a backwards direction. 2 Adduction: The shoulder and arm is brought closer to the mid-line of the body.