Anatomy & Histology · single question
Which cranial nerve controls the pharyngeal phase of swallowing?
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Correct answer: B. CN X (vagus)
- A. CN V handles mastication and the sensory oral preparatory phase.
- B. Correct. The vagus, via the pharyngeal plexus, drives the involuntary pharyngeal phase — soft palate elevation, pharyngeal constriction and laryngeal closure. Vagal damage produces dysphagia with aspiration risk and hoarseness.
- C. CN VII controls lip seal and the oral phase, plus taste to the anterior two-thirds of the tongue.
- D. CN XII moves the tongue during the oral phase of the swallow.
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