The nerves that innervate the diaphragm arise from which area?

a. Lumbar region of the spine
b. Sacral vertebrae 4 and 5
c. Spinal plexuses at T2 to T11
d. Spinal nerves C3 to C5

ANS: D
Functionally, the diaphragm is divided into a right and left hemidiaphragm. Each hemidiaphragm is innervated by a phrenic nerve that arises from branches of spinal nerves C3, C4, and C5.

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