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The phrenic nerve innervates the diaphragm which is our main breathing muscle. It is a broad flat sheet that encircles our lower ribcage and separates our thoracic from our abdominal cavities. The phrenic nerve arises from the C3-C5 level of our vertebrae. In the event of a broken neck, that is often the determining factor whether someone will die (from an inability to breathe) or is just paralyzed.

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13y ago
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11y ago

Diaphragm

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diaphragm

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diaphragm

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11y ago

Diaphragm

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Q: What muscle does the phrenic nerve innervate?
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