Vestibulocochlear Nerve- I Flashcards Preview

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Flashcards in Vestibulocochlear Nerve- I Deck (34):
1

Vestibular Division on CN 8

Responds to movement of the head and the position of the head

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Responds to sound

Cochlear Division of CN 8

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The inner ear structures are embedded within the

temporal bone

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bony labyrinth and membranous labyrinth

inner ear structures

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hair cells

membranous labyrinth

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correct The bone labyrinth follows most of the contours of the membranous labyrinth

 The membranous labyrinth follows most of the contours of the bony labyrinth

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Consists of interconnected bony cavities and filled with perilymph

Bony Labyrinth

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perilymph 

high na

low in K

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membranous ducts within the bony labyrinth

Membranous Labyrinth

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endolymph

(low in Na+ , high in K+ )

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endolymph

Membranous Labyrinth

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eventually reabsorbed

endolymph

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made by specialized cells in several locations in the membranous labyrinth.

endolymph

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 leaves through a duct, to reach a sac to get to venous systme

endolymph

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[vertigo, nausea, hearing loss, ringing in the ears

obstruction of endolymph flow

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rank from ant to post

 Vestibule:

Semicircular Canals: 3 on each side: )

 Ampullae

vestibule ampullla semicircular canal

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central enlarged region of bony labrynth

vestibule

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dilation at one end of the each semicircular canals

ampulla

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function in complimentary pairing

L post+ r ant

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left horizontal and r. horizontal 

function in complimentary paring

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Saccule:

Oriented vertically

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Oriented horizontally (when upright)

Utricle:

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located in the bony vestibule

utricule sacule

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linear (horizontal) acceleration

Utricle

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Detect angular acceleration 

Activated with most head movements

Semicircular canals

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 Detects linear (vertical) acceleration (example?)

saccule

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static head position

utricle saccule

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Adjacent to the tallest stereocilia

 the single kinocilium (

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project into endolymphatic interior of the membranous labyrinth

stereocilia

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endolymph

surrrounds stereocilia

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glutamate trigger and triggering CN 8 by 

steeocilia

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moveing toward highest stereocilia

Opens the mechanically gated K+ ion channels •

K+ enters the cell •
 

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High intracellular K+ opens

 

voltage gated Ca+2 channels

Neurotransmitter is released (glutamate)

34

neutral position of stereocilia

gate partially open