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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.
All of these muscles are anchored to the bone of the upper arm, the humerus, by a common tendon, known as the common extensor tendon. These muscles serve primarily to extend the wrist and fingers. Ad. The main muscle that works to straighten the arm by extending the elbow joint is the triceps brachii extensor muscle.ll of these muscles are anchored to the bone of the upper arm, the humerus, by a common tendon, known as the common extensor tendon. These muscles serve primarily to extend the wrist and fingers. Ad. The main muscle that works to straighten the arm by extending the elbow joint is the triceps brachii extensor muscle.