nerve arises from the lateral cord of the brachial plexus (C5-C7). It exits
the axilla by piercing the coracobrachialis muscle.
Injury to the musculocutaneous nerve results in paralysis of coracobrachialis, biceps brachii, and brachialis muscles. The patient experiences weakened flexion of the elbow joint and supination of the forearm. There may also be loss of sensation on the superior aspect of the forearm.