Which spinal nerve levels innervate the diaphragm?

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Multiple Choice

Which spinal nerve levels innervate the diaphragm?

Explanation:
The diaphragm’s motor control comes from the phrenic nerve, which arises from the cervical nerve roots C3, C4, and C5, with C4 often considered the primary contributor. This means the spinal nerve levels that innervate the diaphragm are C3 through C5. The other ranges (thoracic or lumbar) do not provide the main motor input to the diaphragm, and a broader range including C2 to C6 would unnecessarily include levels not primarily involved.

The diaphragm’s motor control comes from the phrenic nerve, which arises from the cervical nerve roots C3, C4, and C5, with C4 often considered the primary contributor. This means the spinal nerve levels that innervate the diaphragm are C3 through C5. The other ranges (thoracic or lumbar) do not provide the main motor input to the diaphragm, and a broader range including C2 to C6 would unnecessarily include levels not primarily involved.

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