Abstract               Background: The Musculocutaneous nerve is the branch of lateral cord of the brachial plexus. It then passes laterally and pierces coracobrachialis. After piercing coracobrachialis it descend laterally between biceps and lateral side of the arm to continue as lateral cutaneous nerve of the forearm. Commonly musculucutaneous nerve shows variation in origin, course, branches, termination and it's connections with other nerves of brachial plexus. These variations have clinical significance during surgical procedures, in the brachial plexus block and in diagnostic clinical neurophysiology. It is important to be aware of this variation while planning the surgery in the region of the arm, as these nerves are more liable to be injured during the operation. Methods: A comprehensive study was carried out on 48 limbs by using 24 embalmed cadavers. Dissection of infraclavicular part of brachial plexus was done. The variation in the origin, number and course and their correlations to the coracobrachialis were noted. Results: The Musculocutaneous nerve didnot pierce coracobrachialis in 2 of the limbs.

Key Words: Musculocutaneous nerve, Coracobrachialis, Biceps brachii, Axillary artery.