INBDE (Integrated National Board Dental Examination) Practice Exam

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Which CN carries motor supply to muscles of tongue?

  1. XII

  2. X

  3. VII

  4. IX

The correct answer is: XII

The cranial nerve that carries motor supply to the muscles of the tongue is cranial nerve XII, which is the hypoglossal nerve. This nerve innervates the intrinsic and extrinsic muscles of the tongue, allowing for control of tongue movement essential for speech, swallowing, and other oral functions. Cranial nerve X, the vagus nerve, is not responsible for motor supply to the muscles of the tongue. Cranial nerve VII, the facial nerve, is responsible for facial expressions, not motor supply to the tongue muscles. Cranial nerve IX, the glossopharyngeal nerve, is responsible for the sensation and taste of the posterior one-third of the tongue, but it does not carry motor supply to the tongue muscles. Therefore, the correct answer is cranial nerve XII (A).

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