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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.
Deltoid. You are able to move your shoulder joints thanks to the deltoid muscles in each of them. The deltoids are divided into three sections -- anterior, posterior and medial -- and the main function of the set is to draw your arm away from your body, an action also known as abducting the arm.