| Front | Sympathetic pathway: phrenic nerve |
|---|---|
| Back | Phrenic nerve arises from ventral rami of C3-5 ("C3, 4, and 5 keep the diaphragm alive.") and contain: a) Somatomotor b) Somatosensory c) Sympathetic postganglionic axons Sympathetic pathway: 1. Upper thoracic pre/symp axons enter the thoracic sympathetic trunk and ascend. 2. Synapse with post/symp axons at C3-5 ganglia. 3. Post/symp axons exit ganglia through gray rami, enter the ventral root, and descend in the phrenic nerve. |
Tags: autonomic, nervous, system
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