Muscles of the arm and shoulder

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The muscles of the arm and shoulder occupy the proximal portion of the upper limb. Acting on the shoulder and elbow joints, these muscles ensure the mobility of the upper limb relative to the trunk. The shoulder and arm muscles are further subdivided into smaller groups:

• The muscles of the shoulder, often defined as the scapulohumeral muscles, gather four components: the deltoid muscle, the teres major muscle, and the muscles of the rotator cuff. The latter includes four muscles: the supraspinatus, infraspinatus, teres minor, and subscapularis. All these muscles enable the movements and stabilize the shoulder joint. 
• The muscles of the arm are divided into anterior and posterior compartments. Depending on the muscle attachments they act on the shoulder and/or elbow joint, either as flexors (anterior group) or extensors (posterior group) of the arm and/or forearm.

The following video tutorials will help you to learn the anatomy of the muscles of the arm and shoulder.

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Summary