vestibulocohclear nerve 1 part 2

Question 2

in ampulla , located within cristae

Answer 2

hair cells

Question 3

hair cells supporting cells

Answer 3

crista

Question 4

cupula

Answer 4

gelatinous mass hair cells are embedded in

Question 5

tf cupula only half ways across wall of ampulla

Answer 5

f entire way through ampulla wall

Question 7

Bending of the stereocilia toward the utricle (—–l canals) activates CN—-axons

Answer 7

Bending of the stereocilia toward the utricle (horizontal canals) activates CN-VIII axons

angular acceleration

Question 9

angular accelration

Answer 9

relative difference in movement between head and the endolymph; endolymp pushes against cupula

bending its hair cells

Question 10

moving head to right

Answer 10

will make stereocilia move to Kinocilium on the right b/c endolymph moves to left

Question 11

constant ang velocity when head is moving right

Answer 11

endolymph will stay in that direction and activate stereocilia in the other side of the head

when initial angular accel occurs; channels open on the side of hed turn because endolymp in opposit direction of head turn

when on the deceleration the direction changes and points toward Kinocilium on other side of head because it is now traveling indirection of head turn

Question 13

Kinocilium of hair cells are oriented —— utricle in the horizontal canals the (opposite in anterior and posterior canals)

Answer 13

Kinocilium of hair cells are oriented toward utricle in the horizontal canals the (opposite in anterior and posterior canals)

Question 14

if head moves to right then

Answer 14

endolymph move to left in Semicircular Canals

inc firing in right semicirculat canals

Angular acc.

Question 15

left rotation

Answer 15

left left horizontal semicircular canal excited

Increase contraction of the L medial rectus and R lateral rectus

Question 18

Allow fixation on an object even though the head is moving

Answer 18

Vestibulo-ocular Reflex

Question 19

eyes move the direction opposite of the rotation)

Answer 19

Vestibulo ocular reflex

Question 20

connections between the vestibular nucleus

Answer 20

and CN III, IV and VI in Vestibulo-ocular Reflex

Question 22

decrease contraction of the L lateral rectus and R medial rectus

Answer 22

With L rotation of head

Question 23

Oriented horizontally when upright

Answer 23

utricle

Question 24

Oriented vertically when upright

Answer 24

sacule

Question 25

forward - back motions [eg. car] and side-to-side

Answer 25

linear (horizontal) acceleration

by urticle

Question 26

elevator)

Answer 26

Detects linear (vertical) acceleration

by saccule

Question 27

 Provides information about static head position

Answer 27

saccule and utricle

Question 28

maculae(Hair cells (vestibular receptor cells)) on

Answer 28

utricle and saccule

Question 29

within the membranous labyrinth

hair cells and supporting cells

Answer 29

maculae of utricle and saccule

Question 30

embather in otolithic membrane and bathed in endolymph

Answer 30

hair cells of the macula

(utricle and saccule)

Question 31

carbonate crystals called otoconia or otoliths

Answer 31

make the otoconial membrane denser than the endolymph

Question 32

moves with even subtle head movements

Answer 32

otolithic membrane

Question 33

Linear movements

Answer 33

induces movement of the otolithic membrane

Input to CNS via cranial nerve VIII

Question 34

Bending of the stereocilia toward the kinocilium

Answer 34

causes depolarization and an increase in firing

in utricle and saccule

Question 35

Hair cells are aligned within the macula

Answer 35

along the striola

(utricle and saccule)

Question 36

within internal auditory meatus

Answer 36

Vestibular Ganglion

Question 37

Superior, Inferior, Medial and Lateral Vestibular Nuclei

Answer 37

bilaterally to Medial (neck) and Lateral Vestibulospinal Tract(SC)

Vestibular Nuclei and their Efferents

Question 38

bilat to To other cranial nerve nuclei

Answer 38

Superior, Inferior, Medial and Lateral Vestibular Nuclei

Vestibular Nuclei and their Efferents

Question 39

Superior, Inferior, Medial and Lateral Vestibular Nuclei

Answer 39

ips to cerebellum

Vestibular Nuclei and their Efferents

Question 40

Vestibulo ThalamoCortical Pathway

Answer 40

lateral and superior vestibular nuclei project to the VPL

Question 41

from the thalamus,

Answer 41

the vestibular neurons project to parietal cortex

Vestibulo ThalamoCortical Pathway