Brachial Plexus Injury (BPI) is basically an umbrella term for a variety of conditions that may impair function of the brachial plexus nerve network. The brachial plexus is a network of nerves that originate in the neck region and branch off to form most of the other nerves that control movement and sensation in the upper limbs. Most injuries to the brachial plexus are caused by trauma. Some injuries may heal on their own, whilst others will require complex surgery, which will need to be performed by a specialist neurosurgeon. The healing process can take several months.