An anatomical study of formation of the median nerve

Anatomical variations in the formation of the media n nerve are common. The third root of median nerve is of great academic and clinical significance in orthopedics, surgery, anaesthesiology, Neurophysiology, Physiatr i ts, Sports medicine and Physiotherapy. The aim of this study w as to analyze the anatomical variations in the numb er of root of median nerve. A total of 14 cadavers were used for the study in the laboratory of Morphology of the Un iversity of Pamplona. It was observed that the left median nerv e had three roots (one medial and two laterals).The third root originated between the origins of the lateral root and the musculocutaneous nerve from lateral cord of brachial plexus. The significance of the variations of the b rachial plexus is relevant in the management of sur gical exploration of the axilla and in the nerve blocks p rocedures of the brachial plexus.