Abstract: Backgrounds: The Brachial plexus is a somatic plexus formed by the anterior rami of C5 to C8, and most of the anterior ramus of T1. It originate in the neck and consists of root, trunk, divisions and cords. The cords are lateral, medial and posterior cords. One of the terminal branch of the Lateral cord of the brachial plexus is the Musculocutaneous nerve. The musculocutaneous nerve is derived from the anterior rami of 5th to 7th cervical spinal nerve. It pierces the corachobrachialis muscles and descends down between the biceps brachii and brachialis muscles laterally and its continuation in the forearm is called as the lateral cutaneous nerve of the forearm. The muscles of the anterior compartment of arm i.e., Corachobrachialis, Biceps brachii and Brachialis are supplied by the Musculocutaneous nerve. Sometimes the musculocutaneous nerve may arise from the Median Nerve, Lateral root of the Median Nerve or it may be absent unilaterally or bilaterally.