A rare variation in the formation of the lateral cord and median nerve of brachial plexus : a case report.

ABSTRACT

Brachial plexus is the plexus of nerves that supplies the upper limb. The Anatomical variations of the brachial plexus in humans have clinical significance to surgeons, radiologists and anatomists. Variation in the origin and distribution of branches of brachial plexus are common but variation in the roots, trunks and cords are very rare. Here we report a rare variation in the formation of lateral cord and variation in origin of median nerve. Lateral cord was formed by anterior division of upper trunk alone (C5, C6 ), but an additional intermediate cord between medial & lateral cord was found which was a continuation of anterior division of middle trunk (C7) . Median nerve was formed by A lateral root carrying C5and C6 fibers arising from lateral cord, intermediate cord carrying C7 fibers and medial root of medial cord carrying C8 and T1 fibers.