An abnormal cVEMP suggests involvement of which structure?

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Multiple Choice

An abnormal cVEMP suggests involvement of which structure?

Explanation:
Abnormal cVEMP points to dysfunction of the saccule and the inferior vestibular nerve. The cVEMP is a reflex recorded from the sternocleidomastoid muscle in response to loud sounds or vibrations, and its afferent pathway travels from the saccule through the inferior vestibular nerve to brainstem centers that influence neck motor neurons. When the saccule or this inferior nerve pathway is impaired, the cVEMP response becomes abnormal. This is different from utricle involvement (tested with oVEMP via the superior vestibular nerve), semicircular canal/ VOR pathways (tested separately), or cochlear/hearing function (not reflected in cVEMP).

Abnormal cVEMP points to dysfunction of the saccule and the inferior vestibular nerve. The cVEMP is a reflex recorded from the sternocleidomastoid muscle in response to loud sounds or vibrations, and its afferent pathway travels from the saccule through the inferior vestibular nerve to brainstem centers that influence neck motor neurons. When the saccule or this inferior nerve pathway is impaired, the cVEMP response becomes abnormal. This is different from utricle involvement (tested with oVEMP via the superior vestibular nerve), semicircular canal/ VOR pathways (tested separately), or cochlear/hearing function (not reflected in cVEMP).

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