4.18 Vestibular Flashcards Preview

7303 Neuroanatomy > 4.18 Vestibular > Flashcards

Flashcards in 4.18 Vestibular Deck (33)
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1
Q

2 components of vestibular

A
  • peripheral

- central

2
Q

What is in the peripheral vestibular system?

A

inner ear receptors that signal position and movement of the head

3
Q

The central vestibular system consists of neurons that: (4)

A
  1. contribute to conscious orientation and acceleration through space
  2. mediate reflexive adjustments to maintain visual acuity and equilibrium
  3. have both sensory and motor function
  4. have extensive cerebellar connections
4
Q

Which system depends heavily on vestibular? Why?

A
  • visual

- eyes move in a compensatory way with the head

5
Q

Where do semicircular canals primarily project?

A

medial and superior vestibular nuclei

not as much to lateral and inferior nuclei

6
Q

semicircular canals are for detection of

A

rotation

7
Q

What is a major function of the lateral vestibular nucleus?

A

serves as an important UMN for the lateral vestibulospinal tract

8
Q

What is a major function of the medial vestibular nucleus

A

important UMN for medial vestibulospinal tract

9
Q

The macula is for

A

linear acceleration

10
Q

What interacts with the hypothalamus that is important for endocrine autonomics?

A

RF

11
Q

What does the RF do with respect to vestibular?

A

controls autonomic responses to vestibular inputs

12
Q

lack of RF input (I think) my cause these vestibular effects

A
  • nausea
  • vomiting
  • dizziness
  • pallor
  • sweating

*carsick

13
Q

What are the superior and medial vestibular nuclei for?

A

eye coordination

14
Q

Which CNs do the superior and medial vestibular nuclei affect? Which reflex is this associated with?

A

3, 4, 6

VOR

15
Q

components of the bony labyrinth

A
  • 3 semicircular canals
  • 2 otolithic organs
  • membranous labyrinth
16
Q

How do the semicircular canals detect rotation?

A

via movement of endolymph

17
Q

position of canals to one another

A

orthogonal

18
Q

canals open at each end at the

A

utricle

19
Q

The utrical is an

A

otolithic organ

20
Q

swelling at the end of the canals

A

ampulla

21
Q

What does the ampulla contain?

A

crista

22
Q

What does the crista contain?

A
  • support cells

- hair cells embedded in gelatinous cupula

23
Q

What does the 90˚ orientation of the canals imply?

A

only 1 set of hair cells affected at a time

24
Q

Hair cells are how this happens

A

signaling of head acceleration

25
Q

Hair cells are embedded in the

A

cupula

26
Q

If hair cells bend toward the _____, we get activation

A

kinocilium

27
Q

If hair cells bend toward the _____, we get inhibition

A

stereocilia

28
Q

Baseline activity of hair cells

A

always firing tonically

29
Q

Activation/inhibition causes

A

speeding up or slowing down of firing rate

30
Q

How do the canals work?

A
  • work in pairs

- get essentially equal and opposite actions

31
Q

What happens when the R side is being activated?

A

get roughly the same amt of inhibition from the L side

32
Q

What happens to the fluid during spinning?

A
  • fluid speeds up to match rate of turning

- when you stop, the fluid sloshes back

33
Q

With a single plane of rotation, how many pairs of canals are being affected?

A

ONE