Lecture 6 Flashcards Preview

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Flashcards in Lecture 6 Deck (20):
1

fn of the semicircular canals

sense rotational movements/acceleration of head

2

which are the otolith organs

utricle and sacule

3

fn of utricle and sacule

respond to linear acceleration and static position of head

4

where are vestibular hair cells found

utricle
saccule
ampullae

5

where are sensory epithtelial cells for utricle and saccule found

macula

6

where are sensory epithtelial cells for semicircular canals found

crista

7

saccular macula is oriented?

vertically

8

utricular macula is oriented

horizontally

9

saccular macula respond best to movements that are

linear vertical acceleration (up and down)

10

utricular macula respond best to movements that are

linear horizontal acceleration (side to side)

11

importance of striola

divides haircells to have two opposing polarities (one side hyperpols, the other depols)

12

if stereocilia bend towards kinocilium then (a) takes place
(b) does the firing rate inc or dec

(a) depol
(b) increasing in firing rate

13

scarpas ganglion projects to

vestibular nuclei of caudal pons and rostral medulla

14

lateral vestibular nuclei project to

cerebellum
spinal cord

15

medical vestibular nucleus projects to

extraocular motornuerons
neck motorneurons (via medial longitudinal fasciculus)

16

which CN innervate extraocular motorneurons

3
4
6

17

fn of the vestibulo colic reflex

activate neck muscle to maintain head position

18

fn of vestibulo spinal reflex

gaze can remain fixed on an object even if head moves

19

fn of vestibulo-spinal reflex

maintain balance and posture

20

cell bodies of primary vestibular afferent neurons are found in the?

scarpas ganglion