Which nerve is the primary sensory nerve for the face (divisions V2 and V3 carry most sensation)?

• A. Vagus X
• B. Facial VII
• C. Glossopharyngeal IX
• D. Trigeminal V

Answer: (D)

General sensation of the face is carried primarily by the trigeminal nerve. This nerve provides somatic sensory input to the face through its three divisions, with the maxillary (V2) and mandibular (V3) divisions supplying most of the mid and lower face, including the cheeks, lips, teeth, gums, and much of the oral mucosa. That broad, face-focused sensory role is what makes it the main sensory nerve for facial sensation.

The other nerves listed have different functions. The vagus handles autonomic and sensory roles in the thorax, abdomen, and parts of the throat; the facial nerve mainly controls facial muscles and carries some taste from the anterior tongue; the glossopharyngeal nerve provides taste and sensation to the posterior tongue and oropharynx. None of these are the primary conduit for the face’s general sensory input, which is MGM—trigeminal.