Brachial Plexus Pathology

The brachial plexus is a network of nerve fibers formed from the lower four cervical and first thoracic nerve roots (C5-T1). It runs from the spine, travels down the neck, runs posterior to the clavicle before entering the axilla and then the arm. It is divided into roots, trunks, divisions (underneath clavicle), cords, and branches.

File:Brachial plexus 2.svgCredit: Wikipedia Commons.

Case #1. Brachial plexus avulsion (arrow).