Monday, March 16, 2015

c. Facial nerve

Which of the following cranial nerves is tested with stimulation of the anterior two-thirds of the tongue with sugar or salt while the tongue is protruded?

a. Ophthalmic branch of the trigeminal nerve
b. Vagus nerve
c. Facial nerve
d. Maxillary branch of the maxillary nerve
e. Mandibular branch of the trigeminal nerve

The answer is c.The facial nerve (cranial nerve VII) mediates taste (salty and sweet) on the anterior two-thirds of the tongue. The glossopharyngeal nerve (cranial nerve IX) mediates taste (bitter and sour) on the posterior one-third of the tongue.


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