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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.
Shoulder Muscles and Shoulder Tendons. Muscles in the back, neck, shoulder, chest and upper arm all work together to support and move the shoulder. One of the most important is the deltoid. Tendons are elastic, soft, connective tissue structures that attach muscles to bone.Muscles move the bones by pulling on the tendons.he shoulder is not a single joint, but a complex arrangement of bones, ligaments, muscles, and tendons that is better called the shoulder girdle. The primary function of the shoulder girdle is to give strength and range of motion to the arm. The shoulder girdle includes three bonesâthe scapula, clavicle and humerus.