USMLE Step 1 Quiz
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RESPIRATORY SYSTEM
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A 40-year-old man suffers a traumatic injury to his cervical spine at the C4 level in a diving accident. In the emergency department, he is found to have complete paralysis of his diaphragm, although his intercostal and abdominal muscles have some preserved function. He requires immediate intubation and mechanical ventilation.
The paralysis of this patient's primary muscle of inspiration is due to injury of the motor neuron axons that constitute which of the following nerves?
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