<P> The phrenic nerve originates mainly from the 4th cervical nerve , but also receives contributions from the 5th and 3rd cervical nerves ( C3 - C5 ) in humans . Thus , the phrenic nerve receives innervation from parts of both the cervical plexus and the brachial plexus of nerves . </P>
where do the nerves that control the diaphragm exit the cns
mainly from the 4th cervical nerve also receives contributions from the 5th and 3rd cervical nerves ( C3 - C5 ) in humans