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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.
The muscles of the upper arm include the biceps and triceps. This pair of muscles performs the opposite actions of flexing and extending the arm. Other muscle groups are responsible for the flexion and extension of the wrist, the rotation of the arm and the finer movements of our fingers.he deltoid is this muscle here, right at the shoulder joint. You could say that this is the muscle that gives your shoulder that rounded shape that it has. It stabilizes and moves the shoulder and arm. The deltoid is the main abductor muscle of the shoulder, meaning it moves the arm away from the center of the body.