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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.
Anatomy: The muscles on the front of the upper arm comprise three muscles. Two of the muscles bend the elbow joint (M biceps brachii, M brachialis), while the third muscle (M coracobrachialis) brings the arm towards the body (adduction).The biceps muscle also rotates the hand (suppination).Diagnosis:RUPTURE OF MUSCLE ON THE FRONT OF THE UPPER ARM.wo of the muscles bend the elbow joint (M biceps brachii, M brachialis), while the third muscle (M coracobrachialis) brings the arm towards the body (adduction). The biceps muscle also rotates the hand (suppination). Diagnosis: RUPTURE OF MUSCLE ON THE FRONT OF THE UPPER ARM.