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Peripheral nervous system
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====Cervical spinal nerves (C1βC4)==== {{Further|Cervical plexus}} The first 4 cervical spinal nerves, C1 through C4, split and recombine to produce a variety of nerves that serve the neck and back of head. Spinal nerve C1 is called the [[suboccipital nerve]], which provides motor innervation to muscles at the base of the [[skull]]. C2 and C3 form many of the nerves of the neck, providing both sensory and motor control. These include the [[greater occipital nerve]], which provides sensation to the back of the head, the [[lesser occipital nerve]], which provides sensation to the area behind the [[ear]]s, the [[greater auricular nerve]] and the [[lesser auricular nerve]]. The [[phrenic nerve]] is a nerve essential for our survival which arises from nerve roots C3, C4 and C5. It supplies the [[thoracic diaphragm]], enabling [[breathing]]. If the spinal cord is transected above C3, then spontaneous breathing is not possible.{{citation needed|date=May 2020}}
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