A case with a variation of the median nerve

Abstract

Many variations are observed in the brachial plexus while giving off its branches. These variations are important because of leading to misdiagnosis and mistreatment. In this study we found a variation of the median nerve in a routine dissection of the left upper limb of a white male cadaver, age of 60 years-old and weight of 70 kilograms. Both the lateral and the medial roots of the median nerve joined near the insertion of the coracobrachialis muscle forming the median nerve. The musculocutaneous nerve only gave off muscular branches to the coracobrachialis and brachialis muscles. The muscular branch of the biceps brachii muscle originated directly from the lateral cord at the origin level of the coracobrachialis muscle.