Multiple bilateral neuroanatomical variations of the nerves of the arm

Introduction The median nerve is formed by the two roots of the brachial plexus the lateral root from the lateral cord and the medial root from the medial cord. The medial cord crosses the third part of the axillary artery and joins with the lateral root to form the median nerve lateral to the artery. The median nerve crosses the brachial artery in the middle of the arm from lateral to medial side. It does not receive any communicating branch from the musculocutaneous nerve normally. The musculocutaneous nerve is the branch of the lateral cord of the brachial plexus. It gives a muscular branch to the coracobrachialis and then pierces the same muscle and then comes out of the lateral border of the muscle and descends between biceps and brachialis and supplies them and then continues as the lateral cutaneous nerve of the forearm.