Incomplete formation of posterior cord of brachial plexus: A case report

Brachial plexus is a network of nerves formed at the root of the neck to provide motor and sensory branches to the upper limb. The major contribution for this plexus is by the anterior primary rami of C5,6,7,8 and T1. The roots join to form the trunks which in tum divide into anterior and posterior divisions to form the cords. The knowledge of brachial plexus is important for the anaesthetists while administering brachial blocks. During routine dissection in a female cadaver aged 65years, the posterior division of upper trunk fails to fuse with the posterior divisions of the middle and lower trunk and gives out four branches independently.