Diaphragm roots — FRCA Primary MCQ
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Correct answer: E — C3 to C5 roots
The phrenic nerve arises from C3 to C5. Ischial spine is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. Cervicothoracic sympathetic ganglion is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. Internal superior laryngeal nerve is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. Sacral epidural space is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. In Primary FRCA anatomy, the tested structure should explain the block, airway sign or regional complication in the stem.
Reference: Ellis, Feldman & Harrop Anatomy for Anaesthetists; Primary FRCA textbooks