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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 upper arm is attached to the shoulder by the rotator cuff, which is a group of muscles and tendons that form a cuff around the shoulder joint. The joint capsule is another nonbone part of the shoulder joint, and is made up of a sheet of thin fibers, allowing for a wide range of motion.