The highly organized network of human nervous system is well appropriate for the perfect coordination and functioning of the body. Thus, a well studied and thoroughly researched knowledge regarding the anatomy of nerves is highly vital. The brachial plexus formation has been associated with lots of anatomical variations. The present case report describes another variation where musculocutaneous nerve after giving its motor component in the arm is not continuous with its sensory part in the forearm. The motor component of musculocutaneous nerve ends by supplying coracobrachialis muscle whereas the other forearm muscles are innervated directly from the lateral cord and one of these branches is continuous as the sensory component of the normal musculocutaneous nerve named as lateral cutaneous nerve of forearm. In our case report, we also aim to explain the possible developmental mechanisms behind the nerve variations along with their clinical implications.

Keywords: Brachial plexus; Musculocutaneous nerve; Lateral cutaneous nerve of forearm; Median nerve.