| Front | Phrenic nerve |
|---|---|
| Back | Structure: bilateral branches of the ventral rami in the neck, formed from the C3-5 spinal nerves ("C3, 4, and 5 keep the diaphragm alive") Components: somatomotor, somatosensory, symp/post Pathway: 1. Arises from C3-5 ventral rami 2. Descends in lower neck on anterior scalene muscle 3. Enters thoracic inlet near internal thoracic artery 4. Passes anterior to root of the lung 5. Passes through superior mediastinum deep to mediastinal parietal pleura 6. Passes through middle mediastinum between fibrous pericardium and mediastinal parietal pleura Function: Innervate structures of the thoracic and abdominal cavities 1. Diaphragm - somatomotor, proprioceptive (sensory), symp/post (to blood vessels) 2. Mediastinal parietal pleura - somatosensory 3. Fibrous pericardium - somatosensory 4. Central diaphragmatic parietal pleura - somatosensory |
Tags: nerves
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