Absence of musculocutaneous nerve associated with clinically important variations in the formation , course and distribution of the median nerve – a case report

The median nerve is usually formed just lateral to the third part of the axillary artery by the union of its medial and lateral roots coming from medial and lateral cords of the brachial plexus respectively. It then descends down in the front of the arm and crosses superficial to the brachial artery from lateral to medial side. It enters the cubital fossa along with the brachial artery. Normally it does not supply the muscles of the arm. The musculocutaneous nerve is a branch of the lateral cord of the brachial plexus. It pierces the coracobrachialis muscle and enters the front of the arm. It supplies the biceps, brachialis and coracobrachialis muscles. We saw a variation in the median nerve associated with the absence of musculocutaneous nerve.