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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.
When the contracts, the arm is flexed at the elbow because the radius bone is pulled closer to the shoulder. Voluntary muscles work in pairs called antagonistic systems. The antagonistic muscle to the biceps is the triceps. When the bicep contracts, the triceps and vice versa.