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During an examination of a 77-year-old woman, the physician notices that when the patient is asked to say “ah,” the soft palate does not move symmetrically, and the uvula deviates to the right side. This movement most likely indicates a lesion involving which of the following nerves?
A. Left glossopharyngeal (CN IX)
B. Left vagus (CN X)
C. Right hypoglossal (CN XII)
D. Right vagus (CN X)
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A. Left glossopharyngeal (CN IX)
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a
hey ku la me is standard testing why are you writing ah ? is it a misprint or you have twisted the ques?
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Option B is correct. The pharyngeal branch of the vagus nerve (CN X) innervates all muscles of the soft palate, except the tensor veli palatini. A lesion involving the left vagus nerve would leave the muscles on the right unopposed, resulting in deviation of the uvula to the right. Innervation of the soft palate is normally tested by asking the patient to say “ah.”
