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These bulky muscles also give the arm its strength. The muscles of the arm that can be seen easily on the surface include: 1  Biceps: This large muscle of the upper arm is formally known as the biceps brachii muscle, and rests on top of the humerus bone. 2  It rotates the forearm and also flexes the elbow.
Your arm is kept in your shoulder socket by your rotator cuff, a group of muscles and tendons that help the shoulder rotate and move. These muscles come together as tendons to form a covering around the head of the humerus, the upper arm bone.