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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 shoulder complex comprises 30 muscles. These muscles both move the shoulder and stabilise it - 'movers' and 'shakers'. The rotator cuff muscles predominantly stabilise the glenohumeral joint, but also contribute significantly to movement.n the shoulder the body is the humeral head and the equal but opposite forces are the rotator cuff muscles. In a force couple, force generated by one muscle (the primary agonist) requires the activation of an antagonistic muscle so that a dislocating force does not result (Nordin & Frankel, 2001).