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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.
The muscles can only pull against the bone not push it. So to bend your arm at the elbow, the bicep pulls the lower arm up. To streighten your arm, the tricep pulls the lower arm back out. the muscles have to work in pairs opposite each other to make movement.