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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.
Extensors are on the inside of the arm and help extend the arm outward. Flexors are at the back of the elbow and pull it closer to the body by bending the elbow. Biceps brachii: The large muscle of the upper arm flexes the arm and powerfully twists the forearm, turning the palm upward.