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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.
Some of the main muscles of the shoulder that move the upper arm include the deltoid and the pectoralis major. The deltoid is this muscle here, right at the shoulder joint. You could say that this is the muscle that gives your shoulder that rounded shape that it has.It stabilizes and moves the shoulder and arm.The deltoid is the main abductor muscle of the shoulder, meaning it moves the arm away from the center of the body.he deltoid is this muscle here, right at the shoulder joint. You could say that this is the muscle that gives your shoulder that rounded shape that it has. It stabilizes and moves the shoulder and arm. The deltoid is the main abductor muscle of the shoulder, meaning it moves the arm away from the center of the body.