[15] The posterior rami provide spine muscle and trunk skin sensation. The most complex nerve plexus is the brachial plexus, consisting of cervical nerves 5 through 8 (C5 to C8) and thoracic nerve ...

About one in 1,000 children are born with brachial plexus birth injury (BPBI), upper extremity weakness or paralysis resulting from trauma to the brachial plexus nerves during childbirth.

Associated with Horner's syndrome in one third of those severely affected. The physical findings reflect the degree of muscle paralysis from specific spinal nerve injury and unaffected opposing ...