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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.
Movements of the Upper Limb - Page 6 of 18. Adduction of the arm is also called adduction of/at the shoulder. This motion can be divided into two motions: downward rotation of the scapula and true adduction of the arm at the shoulder. Muscles: pectoralis major and minor, latissimus dorsi, teres major, gravity (depending on body position), and even the lowest fibers of the deltoid (making deltoid its own antagonist)