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Anatomy & Histology · single question

The gag reflex is primarily mediated by which cranial nerve?

  1. CN V (Trigeminal)
  2. CN IX (Glossopharyngeal)
  3. CN VII (Facial)
  4. CN X (Vagus)
Show answer and explanation

Correct answer: B. CN IX (Glossopharyngeal)

  • A. CN V mediates sensation of the anterior oral cavity, face, and teeth — not the gag reflex.
  • B. Correct. CN IX (Glossopharyngeal nerve) mediates the afferent limb of the gag reflex, with CN X providing the efferent limb.
  • C. CN VII mediates facial expression and taste to anterior 2/3 of tongue, not the gag reflex.
  • D. CN X provides the efferent (motor) limb of the gag reflex, not the primary afferent limb.

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