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USMLE Step 1 Forum USMLE Step 1 Discussion Forum: Let's talk about anything related to USMLE Step 1 exam |
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#1
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You touch the left side of the pharynx and the patient's uvula deviates to the left and you touch the right side of the pharynx and the patient does not gag. Where is the lesion?
a- Left glossopharyngeal |
#2
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Right glossopharyngeal nerve lesion answer C
It serves the sensory part of the gag reflex, that's why the patient did not gag when we touched the right side |
#3
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If it is only the right glossopharyngeal then why the uvula deviated when we touched the left side? think about it |
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#4
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When the patient uvula deviates to the left it means a right sided vagus motor lesion.
When the gag is absent on the right it means the right glossopharyngeal is also not functioning Answer is D |
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#6
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I liked this question
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#7
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deviation of uvula to left means rt vagus nerve lesion but i want to ask if we touched rt side and no gag reflex why is glossopharyngeal it could be either glossophayngeal(afferent) or vagus(efferent)
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#8
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Remember that afferent glossopharyngeal goes unilaterally to the brains stem and then it comes back "bilaterally" to both vagus nerves on both sides. In this case it was the ability to elicit the gag on the left side that helped us to understand that the absent right sided gag is actually sensory not motor. |
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Neuroanatomy-, Step-1-Questions |
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