Which nerve provides motor innervation to the diaphragm?

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Multiple Choice

Which nerve provides motor innervation to the diaphragm?

Explanation:
Motor control of the diaphragm comes from the phrenic nerve, which carries somatic motor fibers from the cervical spinal cord levels C3 to C5. It travels from the neck into the thorax and provides the diaphragm’s primary motor innervation, enabling its rhythmic contraction during breathing. The other nerves don’t supply the diaphragm: intercostal nerves innervate the intercostal muscles; the vagus nerve mainly carries parasympathetic fibers to thoracic and abdominal organs (and some other motor functions, not diaphragmatic contraction); and the accessory nerve supplies the trapezius and sternocleidomastoid.

Motor control of the diaphragm comes from the phrenic nerve, which carries somatic motor fibers from the cervical spinal cord levels C3 to C5. It travels from the neck into the thorax and provides the diaphragm’s primary motor innervation, enabling its rhythmic contraction during breathing. The other nerves don’t supply the diaphragm: intercostal nerves innervate the intercostal muscles; the vagus nerve mainly carries parasympathetic fibers to thoracic and abdominal organs (and some other motor functions, not diaphragmatic contraction); and the accessory nerve supplies the trapezius and sternocleidomastoid.

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