vestibular system

Question 1

vestibular system

Answer 1

the set of 5 organs located in aech ear that sense head movement and head orientation with respect gravity
- info about balance and acceleration

Question 2

what does the vestibular give us

Answer 2

• our sense of self motion and orientation
• balance
• stabilizing our vision hen our head is moving

Question 3

translation movements

Answer 3

x: forward/backward
y: side to side
z: up/down

Question 4

rotational movements

Answer 4

roll: ear to shoulder
pitch: nodding
yaw: shaking no

Question 5

semicircular canals

Answer 5

sense organs that are responsible for sensing rotational movements
- they each contain an ampulla with a cristae with hair cells

Question 6

the 3 canals

Answer 6

1. anterior: vertical
2. posterior: vertical
3. horizontal

Question 7

directional sensitivity

Answer 7

each ear canal is most sensitive to rotation about the axis that passes through the center of their loop
- prefers the center but will respond to surround angles

Question 8

semicircular alignment

Answer 8

• they are mirror images in each ear
• horizontal are on the same plane
• the anterior of one ear is aligned with the posterior of the other

Question 9

push pull arrangement

Answer 9

the two canals with the same preferred orientation will operate in a push pull relationship.
- increase in one causes decrease in the other

Question 10

dynamic response of hair cells

Answer 10

over contant or prolonger acceleration, the deflection of the cupula will sibside and the firing rate of hair cells ill rturn to baseline
- then they will go the other direction and make you dizzy

Question 11

the otolith organs

Answer 11

responsible for linear translational movement
- uticle and saccule
-

Question 12

macula

Answer 12

• contains hair cells in a gelatinuous layer that is toped by otoconia

Question 13

the 2 otoloth organs

Answer 13

1. utricle: horizontal
2. saccule: vertical

Question 14

equivalence principle

Answer 14

• einstein 1907
• the effects of gravity are indistinguishable from acceleration

Question 15

otolith dynamics

Answer 15

they fire proportionally to a constant tilt
- will not return to baseline

Question 16

ampulla

Answer 16

bulb shape structure at the end of each canal
- it contains endolymph and crista

Question 17

crista

Answer 17

cone shape structure lined with hair cells with stereocilia
- contains the endolymph and the cupula

Question 18

cupula

Answer 18

jelly like mass that surrounds the hair cells and separates them from the endolymph

Question 19

kinocilia

Answer 19

sterocilia that are pointed in the same direction next to the hair cells which create aps when they are pushed against

Question 20

macula

Answer 20

in the otoloth organs
- it contains the otoconia and hair cells in a gelatinuous layer

Question 21

octonia

Answer 21

calcium carbonate crystal at the top of the gelatinous layer which move and make hair cells bend because of their delay

Question 22

types of hair cells

Answer 22

type 1: irregular firing pattern
type 2: regular firing pattern