Vestibulocochlear Nerve Flashcards
_______ disease can be caused by endolymphatic obstruction. Can cause ballooning of the membranous labyrinth.
Meziere’s disease
Endolymphatic is high in ______.
potassium
When you get an infection in the air space by the bones you get _______conduction problems.
Air conduction
Saccular macula responds to acceleration in the _____ plane.
Sagital
Ultricular macule (utricle) responds to acceleration in the _______ plane.
Horizontal
Function of inner hair cells
more enervated, conduct sound
Outer hair cells
amplify vibrations of the basilar membrane
Otoacoustic emissions reflex
Control of outer hair cells involves superior olivary neurons that project through CN VIII directly to the cell bodies of outer hair cells. This is an inhibitory activity resulting in the decrease in the contractility of the outer hair cells especially during high frequency noise.
Acoustic reflex
mediated by the stapedius. CN VIII in, CN VII out, goes through superior olivary nucleus. Stapedial contraction is best for decreasing low frequency noises and may help filter out low frequency background noises.