Neuro-Anatomical Variation of Lateral Cord of Brachial Plexus

During the educational gross anatomy dissections of the infra-clavicular part of brachial plexus of a 50-year-old male cadaver in our department of anatomy,Andhra medical college, Visakhapatnam, we have encountered a neuroanatomical variation. The lateral cord of brachial plexus and its branches, had a different configuration. On the right side ,the median nerve received very few fibres from the lateral cord of brachial plexus during its formation. On both sides the musculo-cutaneous nerve has given an accessory branch which again joined the main trunk of the median nerve.This variation has clinical importance in median nerve lesions and its distinctive diagnosis. Lesions of the median nerve, if lesion was proximal to this accessory branches, muscles and cutaneous innervations related to this branch were normal.