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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.
Many muscles are responsible for movement in the shoulder, but the primary muscle groups are the rotator cuff, the deltoid and the trapezius. The rotator cuff is a group of muscles and their tendons that attach our upper arm to our shoulder blade.The most important job of the rotator cuff muscles is to provide stability for the ball (the end of the upper arm bone) in the socket and specifically center the ball within the socket during functional movements.he shoulder is made up of three bones: the upper arm bone (humerus), the shoulder blade (scapula) and the collarbone (clavicle). These bones are joined together by muscles, ligaments and tendons that support and stabilize the shoulder, allowing the arm to function. The shoulder is composed of four joints: