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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.
Muscles that act on the shoulder can be classified as extrinsic, intrinsic, pectoral or of the upper arm. Upper arm muscles will be discussed in a later section as although they attach to the shoulder they promote movement of the forearm.