Question
Impaired gag reflex is seen due to a lesion in which cranial nerves?
| A. |
CN V & VI
|
| B. |
CN X & XI
|
| C. |
CN IX & X
|
| D. |
CN VII & VIII
|
Show Answer
|
Correct Answer � C
Explanation
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|
The gag reflex is mediated by cranial nerves IX (the glossopharyngeal nerve) and X (the vagus nerve).
The glossopharyngeal nerve is responsible for the sensory limb of the gag reflex, detecting the stimulus in the oropharynx, while the vagus nerve provides the motor response, leading to the contraction of the pharyngeal muscles.
A lesion affecting either or both of these nerves can result in an impaired or absent gag reflex.
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