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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 rotator cuff is a group of four muscles that are positioned around the shoulder joint. The muscles are named: Supraspinatus; Infraspinatus; Subscapularis; Teres minor; The rotator cuff muscles interlock to work as a unit. They help to stabilise the shoulder joint and also help with shoulder joint movement. The four tendons of the rotator cuff muscles join together to form one larger tendon, called the rotator cuff tendon. This tendon attaches to the head of the bony surface at the top of the upper arm bone (the humerus). There is a space underneath the acromion of the scapula, called the subacromial space.