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Medicine Cranial Nerve Disorders b6a57a17

Cranial Nerve 8 palsy causes all EXCEPT:

A
Gag reflex
B
Vertigo
C
Motion sickness
D
Tinnitus
High-Yield Explanation
Ans. (a) Gag reflexRef : Harrison 19th ed. / 2537-38Damage to the vestibulocochlear nerve may cause the following symptoms:* Hearing loss* Vertigo* False sense of motion* Loss of equilibrium (in dark places)* Nystagmus* Motion sickness* Gaze-evoked tinnitusThe gag reflex has the following pathway* The sensory limb is mediated predominantly by CN IX (glossopharyngeal nerve)* The motor limb by CN X (Vagus nerve).The gag reflex involves a brisk and brief elevation of the soft palate and bilateral contraction of pharyngeal muscles evoked by touching the posterior pharyngeal wall

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