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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 brachialis (brachialis anticus) is a muscle in the upper arm that flexes the elbow joint.It lies deeper than the biceps brachii, and is a synergist that assists the biceps brachii in flexing at the elbow.It makes up part of the floor of the region known as the cubital fossa.he brachialis muscle is innervated by the musculocutaneous nerve, which runs on its superficial surface, between it and the biceps brachii. Part of it is also innervated by the radial nerve (proprioceptive branch) which allows it to be split during certain approaches to the arm.