Which of the cranial nerves should be tested if the patient complains of numbness of the cheek?
A. Cranial nerve III
B. Cranial nerve V
C. Cranial nerve VII
D. Cranial nerve X
ANS: B
Cranial nerve V, the trigeminal nerve, controls the sensation of the face and function of the masseter muscle. Cranial nerve VII, the facial nerve, controls facial expressions or motor function of the facial muscles. Cranial nerve III, the oculomotor nerve, controls the pupil and movement of eyes. Cranial nerve X is the vagus nerve, which is demonstrated by testing the gag reflex.
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