Question
A 26-year-old man comes to the physician for a follow-up examination. Two weeks ago, he was treated in the emergency department for head trauma after being hit by a bicycle while crossing the street. Neurological examination shows decreased taste on the right anterior tongue. This patient’s condition is most likely caused by damage to a cranial nerve that is also responsible for which of the following?
| A. |
Eyelid closure
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| B. |
Facial sensation
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| C. |
Tongue protrusion
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| D. |
Parotid gland salivation
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Show Answer
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Correct Answer � A
Explanation
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Answer A) Eyelid closure
Taste on the anterior two-thirds of the tongue is mediated by cranial nerve VII.
Eyelid closure
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Closing the eyelids is accomplished through the contraction of the orbicularis oculi muscle, which is, like all facial muscles, innervated by the facial nerve (CN VII).
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The chorda tympani branch of the facial nerve innervates the taste buds of the anterior two-thirds of the tongue.
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The facial nerve is also responsible for innervation of the lacrimal gland, submandibular and sublingual glands, and the stapedius muscle.
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