Aim: A complicated network of arrangement of brachial plexus lead to frequent variations in this region. Therefore, a careful dissection of cadavers was performed during routine dissection classes of first year MBBS students. Case Report: During dissection of right arm of a 50 year old male cadaver the median nerve was found to be formed by the union of three roots instead of normally described two. An additional lateral root originated from the lateral cord of the brachial plexus. The medial root united with one lateral root in the axilla, lateral to the axillary artery to form the main trunk of the median nerve. The additional lateral root travelled independently in arm and pierced the coracobrachialis muscle without supplying it and then joined the main trunk of median nerve in the lower one-third of the arm. This type of variation in the median nerve is uncommon. Discussion: Variations in median nerve are documented in the literature but the present case report is rare. Conclusion: A detailed knowledge of normal and variant anatomy of median nerve should be kept in mind for correct diagnosis and appropriate treatment.