Answer:
<em>The answers are: phrenic nerve, cervical spinal nerve, branches of the cervical plexus, the thoracic, and the root of the lung to reach the diaphragm.</em>
Explanation:
One important branch of the cervical plexus is<u> </u><u><em>the phrenic nerve</em></u>, which is formed primarily from the <u><em> cervical spinal nerve</em></u> and some contributing axons from<u><em> branches of the cervical plexus.</em></u>
This nerve travels trhought <u><em>the thoracic</em></u> cavity to innervate <u><em>the root of the lung to reach the diaphragm</em></u> and its important for breathing.
This question is about the network of nerve fibres that supplies innervation to some of the structures in the neck and trunk.