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BMS109 Neuroscience > The Vestibular System > Flashcards

The Vestibular System Flashcards

1
Q

What are the three semi circular canals in the vestibular system

A

anterior vertical, posterior vertical, horizontal

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2
Q

What is located in the ampulla

A

sensory cells

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3
Q

What are the semi-circular canals filled with

A

endolymph

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4
Q

What detects linear motion

A

otolith organs

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5
Q

What detects rotational movement

A

semi circular canals

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6
Q

What does the saccule detect

A

movement in the vertical plane

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7
Q

What innervates the ampulla, saccule and utricle

A

vestibular nerve - 8

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8
Q

TRUE or FALSE - hair cells have a nucleus

A

True

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9
Q

What potentials do hair cells of the vestibular system develop

A

graded potentials

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10
Q

Describe the effect of decreased impulse frequency on hair cells

A

hyper polarisation

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11
Q

What do cochlear inner hair cells lose as they mature

A

kinocillium

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12
Q

What hair cells kept their kinocillium throughout their life

A

saccular hair cells

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13
Q

Which type of vestibular hair cells are similar to inner hair cells

A

type 2

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14
Q

Which type of vestibular hair cells has calyx

A

type 1

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15
Q

What do the saccule and utricle detect

A

head tilt and linear acceleration

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16
Q

What stimulates the saccule and utricle

A

otolithic membrane

17
Q

What is the otolithic membrane

A

gelatinous structure

18
Q

Where does the otolithic membrane sit

A

top of hair cells

19
Q

What are otoconia

A

calcium carbonate crystals

20
Q

What does the otoconia sit on

A

otolithic membrane

21
Q

What is the function of the otolithic membrane

A

add weight

22
Q

What is information from saccule and utricle integrated with

A

proprioreceptors

23
Q

What is the cupula

A

jelly like structure

24
Q

what surrounds the cupula

A

endolymph

25
Q

True or false - hair cells stick up into the ampulla

A

true

26
Q

What displaces the cupula

A

inertia of endolymph

27
Q

Where do potentials from the vestibular organs travel to

A

cerebellum or vestibular nuclei

28
Q

Why do some potentials go straight to the cerebellum

A

speed - prevent falling over

29
Q

Why is the vestibular system faster than the visual system

A

uses ion channels

30
Q

What causes menieres disease

A

excessive endolymph

31
Q

What are the symptoms of menieres disease

A

intermittent vertigo, tinnitus

32
Q

What are the vestibular hair cells

A

mechanoreceptors

33
Q

What is the function of the vestibular nystagmus

A

reset eye position during head rotation

BMS109 Neuroscience (22 decks)

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