Which cranial nerve is primarily responsible for facial sensation and chewing?

• A. Facial nerve
• B. Vagus nerve
• C. Trigeminal nerve
• D. Glossopharyngeal nerve

Answer: (C)

The trigeminal nerve is responsible for facial sensation and chewing. It acts as the main sensory nerve for the face, carrying touch, pain, and temperature from the skin and mucous membranes of the face and mouth. It also has a motor component to muscles of mastication—the jaw-closing muscles (masseter, temporalis, and the pterygoids) and a couple of smaller muscles—via its mandibular division. This combination of facial sensation and jaw movement is what makes it the correct answer. The other nerves don’t provide this dual role: the facial nerve mainly controls facial expression and some taste; the glossopharyngeal and vagus nerves handle other regions of the tongue, pharynx, and throat, not chewing.