Which of the cranial nerves should be tested when a patient presents with right-sided facial droop and inability to close the right eye?
A. Cranial nerve III
B. Cranial nerve V
C. Cranial nerve VII
D. Cranial nerve X
ANS: C
Cranial nerve VII, the facial nerve, controls facial expressions or motor function of the facial muscles. The disorder that causes unilateral facial muscle dysfunction and inability to close the eye is Bell's palsy. Cranial nerve V, the trigeminal nerve, controls the sensation of the face and function of the masseter muscle. 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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