For ten points, name this non-cranial nerve.
This involuntary nerve arising from the third, fourth, and fifth levels of the spinal cord innervates the diaphragm. A mnemonic for this nerve is: "C3, C4, and C5 keep the diaphragm alive." If a break to the neck in this region tragically occurs, the patient may need a tracheotomy and respirator until the intercostals muscles between the ribs take over adequately. For ten points, name this non-cranial nerve.
This involuntary nerve arising from the third, fourth, and fifth levels of the spinal cord innervates the diaphragm.
{phrenic} nerve