Q:

How is the diaphragm innervated?

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How is the diaphragm innervated?


  1. by the phrenic nerves arising from C3 to C5
  2. by the vagus nerves from the respiratory centre
  3. by cranial nerves arising from C5 to C7
  4. by nerves arising from the spinal cord from T5 to T9

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A: Unusually the diaphragm is not innervated by spinal nerves from between vertebrae adjacent to the diaphragm, but from spinal nerves arising from C3 to C5. 

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