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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.
1 Flexion and extension of the shoulder joint in the (sagittal plane). 2  Flexion is carried out by the anterior fibres of the deltoid, pectoralis major and the coracobrachialis. 3  Extension is carried out by the latissimus dorsi and posterior fibres of the deltoid. 4  Abduction and adduction of the shoulder (frontal plane).he shoulder joint is a muscle-dependent joint as it lacks strong ligaments. The primary stabilizers of the shoulder include the biceps brachii on the anterior side of the arm, and tendons of the rotator cuff; which are fused to all sides of the capsule except the inferior margin.