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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.
Here is a list: 1  As they exit the spine, the nerves of the arm, also known as the brachial plexus, can be compressed (pinched) by a herniated disc or between the vertebrae themselves. 2  Between two neck muscles known as the anterior and middle scalene muscles. 3  Under the clavicle.  Under the pectoralis minor.