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7303 Neuroanatomy > FSG 5 > Flashcards

Flashcards in FSG 5 Deck (27)
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1
Q

Vestibular: where are receptors located?

A

hair cells in inner ear

  • SCC
  • otolithic organs (utricles, saccules)
  • ampulla
2
Q

Why is vestibular info so important?

A
  • postural control

- control of eye movements

3
Q

Info gets to the central vestibular system via

A

hair cells innervated by CN 8 » vestibular apparatus » vestibular nuclei

4
Q

SCC signaling to flocculonodular lobe: result

A

coordination

5
Q

SCC signaling to superior and medial vestibular nuclei

A

eye movements

VOR = gaze stabilization

6
Q

function of the lateral vestibulospinal tract

A

postural adjustments in limbs and trunk

7
Q

lateral VST origin

A

macula

8
Q

lateral VST end

A

postural muscles in limbs and trunk

9
Q

medial VST origin

A

macula

10
Q

medial VST end

A

cervical SC

11
Q

medial VST function

A

postural adjustments in cervical SC

12
Q

SCC talks mostly to this nucleus

A

medial vestibular nucleus

13
Q

SCC respond to

A

rotational acceleration/deceleration

14
Q

posterior SCC detects

A

lateral flexion

15
Q

lateral (horizontal) canal detects

A

“no” motion

16
Q

anterior (superior) canal detects

A

“yes” motion

17
Q

How are postural adjustments achieved?

A

reciprocal connections between vestibular nuclei and

  • SC
  • RF
  • superior colliculus
  • CN 11 nucleus
  • vestibular CC
  • cerebellum
18
Q

Where are the vestibular nuclei located?

A

in the pontomedullary junction

19
Q

axons from the (nasal/temporal) retina project ipsilaterally to lateral geniculate body

A

temporal

20
Q

axons from the (nasal/temporal) retina cross the chiasm to the contralateral lateral geniculate body

A

nasal

21
Q

retina » pretectal area =

A

pupillary reflexes

22
Q

retina » tectum =

A
  • orientation

- visually guided eye movements

23
Q

retina » LG » VC =

A

visual guidance and object identification

24
Q

two major types of eye movements

A
  • conjugate

- vergence

25
Q

conjugate eye movements

A

both moving in the same direction

26
Q

vergent eye movements

A

eyes toward midline or away from midline

27
Q

VOR: which canal pairs does it use?

A

can occur in canal pairs of any plane