For that reason, and because of the dexterity of the shoulder joint itself, the musculature of the shoulder is complex, ranging from massive prime mover muscles to finer stabilizer and fixator muscles. The shoulder (or humeroscapular) joint is formed by the articulation of the head of the humerus with the scapula.
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Back View of shoulder muscles 1 Trapezius: Brings the shoulder blades together by retraction and enables elevation and depression… 2 Deltoid (posterior and middle head): Helps in the sideways movement of the upper arm known as… 3 Latissimus dorsi: Allows extension and medial rotation of the arm Image Source: en.wikipedia.org.