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The brachial plexus serves as the key conduit between the central nervous system and the extensive innervation of the upper extremity. One of the most common variants of injury to the brachial plexus results in the condition known as Erb's palsy, in which damage renders the arm disabled through a particular constellation of symptoms. The affected arm hangs down at one's side rotated inwardly with the elbow fully extended and forearm internally rotated.