Root value of phrenic nerve_____________?
Correct answer: C. C3C4C5
- A. C2C3C4
- B. C1C2C3
- C. C3C4C5
- D. C4C5C6
Explanation
The phrenic nerve is formed chiefly by the anterior rami of C3, C4 and C5, with C4 providing the major contribution. The mnemonic is “C3, 4, 5 keep the diaphragm alive.”
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