Editing Neck (section)

=== Cervical plexus ===

** Superior root of ansa      cervicales (C1)
** Branches to SCM (C2 and C3)
** Branches to trapezius (C3      and C4)
** Inferior root of ansa      cervicales (C2 and C3)
** Phrenic nerve
** '''Cervical      cutaneous nerves'''      - arise from C2-C4 spinal nerves. Emerge from posterior surface of SCM.      Note 'Erb's point' where these nerves emerge from SCM is the target for a      regional block.
*** '''Lesser       occipital nerve'''       (C2) passes upwards and backwards along the posterior border of SCM and       supplies skin from auricle back to occipit
*** '''Great       auricular nerve'''       (C2, 3) passes upwards immediately behind EJV to supply skin of the       auricle and pre-auricular region, lying deep to platysma. Anterior       division supplies skin over parotid and ear lobe, and posterior division       supplies retro-auricular skin.
*** '''Transverse       cervical nerve'''       (C2, 3) passes horizontally across SCM to supply skin of anterior neck
*** '''Supraclavicular       nerve''' (C3, 4)       passes downwards and divides into branches which pass over the clavicle       supplying the more lateral reaches of the neck