Which vertebrae keep the diaphragm alive by supplying its nerve endings?

Which vertebrae keep the diaphragm alive by supplying its nerve endings?

• A. C2, C3, C4
• B. C3, C4, C5 keep the diaphragm alive.
• C. C1, C2, C3
• D. C4, C5, C6

Answer: (B)

The diaphragm is driven by the phrenic nerve, which comes from three cervical nerve roots: C3, C4, and C5. This trio is why those particular levels are said to keep the diaphragm alive. The phrenic nerve provides the motor input that contracts the diaphragm, enabling inspiration and ventilation. C4 is the dominant contributor, but the overall innervation depends on all three roots forming the intact nerve. If any of these roots are compromised, diaphragmatic movement on that side can be reduced or lost, leading to breathing difficulty.

The diaphragm is driven by the phrenic nerve, which comes from three cervical nerve roots: C3, C4, and C5. This trio is why those particular levels are said to keep the diaphragm alive. The phrenic nerve provides the motor input that contracts the diaphragm, enabling inspiration and ventilation. C4 is the dominant contributor, but the overall innervation depends on all three roots forming the intact nerve. If any of these roots are compromised, diaphragmatic movement on that side can be reduced or lost, leading to breathing difficulty.