27-Motor8-Vestibular Flashcards Preview

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Flashcards in 27-Motor8-Vestibular Deck (40)
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1

Signals from vestibular apparatus leave in cranial nerve ___:___

VIII, vestibulocochlear

2

Three compartments of vestibular system

- bony labyrinth
- membranous labryinth
- endolymph

3

Vestibule is part of the [bony/membranous] labyrinth

bony

4

Semicircular canals are part of the [bony/membranous] labyrinth

bony

5

Saccule is part of the [bony/membranous] labyrinth

membranous

6

Utricle is part of the [bony/membranous] labyrinth

membranous

7

Semicircular ducts are part of the [bony/membranous] labyrinth

membranous

8

Fluid inside membranous labyrinth

endolymph

9

___ sense head rotation

Semicircular ducts

10

___ sense gravity and linear head motion

Otolithic organs

11

Otolothic organs include ___ and ___

saccule and utricle

12

Primary vestibular afferents terminate in ___

vestibular nuclei

13

Vestibular nuclei integrate inputs from vestibular system with other inputs from (x3)

spinal cord, cerebellum, and visual system

14

Vestibular nuclei project to ___ (x4)

motor structures:
- oculomotor nuclei (oculomotor reflexes)
- reticular system, spinal cord (skeletal reflexes)
- cerebellum (motor coordination, balance)
- thalamus (motor control, position sense)

15

Primary afferents from semicircular ducts terminate primarily in ___ vestibular nuclei

superior and medial

16

Primary afferents from otolithic organs terminate primarily in ___ vestibular nuclei

lateral

17

Information from semicircular ducts primarily affects reflexes that involve ___

gaze

18

Information from otolothic organs primarily affects reflexes that involve ___

anti-gravity (e.g. posture)

19

Function of vestibulocollic reflex

stabilize head position

20

Hair cells:
Deflection *toward* kinocilium produces [depolarization/hyperpolarization]

ON direction, depolarization

21

Hair cells:
Deflection *away* from kinocilium produces [depolarization/hyperpolarization]

OFF direction, hyperpolarization

22

[True/false]: depolarizing hair cells increases firing rate of CN VIII

true

23

Hair cells in ampulla are embedded in ___

christa = a ridge of epithelium

24

[True/false]: hair cells in the ampulla all have same ON direction

true

25

Cupula

gelatinous flap into which stereocilia of hair cells project

26

Head rotation to the left [activates/inhibits] left horizontal semicircular duct

activates

27

Head rotation to the left [activates/inhibits] right horizontal semicircular duct

inhibits

28

Macula

patch of hair cells in otolothic organ

29

Otolithic membrane

gelatinous sheet, attached to surface of macula, contains otoliths

30

Otoliths

calcium carbonate crystals with higher density than endolymph