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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.
They are involved in all shoulder motions: when the muscles contract, they pull on the rotator cuff tendon, causing the shoulder to rotate upward, inward, or outward, hence the name Rotator Cuff. The Rotator Cuff ligaments attach bone to bone and provide stability to the shoulder joint bones. Between the bones, muscle and other soft tissue there are several bursae (fluid filled sacs) and synovial fluid (lubricates your joint), which permit smooth gliding between the joint.