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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.
It isn't. The triceps brachii muscle (which is actually a group of three muscles) is the strongest set of muscles in the arm and accounts for nearly 60% of the upper arm's mus â¦ cle mass.The triceps are primarily responsible for the extension of the elbow joint (straitening of the arm). For instance to bend and close the arm at the elbow, the flexor muscles (biceps) contract while the opposing triceps relax. And then to straighten the arm, the triceps (extensor muscles) will contract while the biceps relax.   Rotator muscles work together to turn and twist the arm.