the vestibular system

Question 1

what 2 questions does the vestibular system answer

Answer 1

where am i going
which way is up

Question 2

how does the vestibular system make sense of where you are

Answer 2

head angular acceleration (head rotation)
head linear acceleration (gravity)

Question 3

all three dimensional moving bodies have _ degrees of freedom

Answer 3

6

Question 4

all three dimensional moving bodies have 6 degrees of freedom
how are they organised

Answer 4

3 are translational
3 are rotaional

Question 5

what is translational motion

Answer 5

linear movements in an x, y, z acis

Question 6

what is rotational motion

Answer 6

bodys rotation rlative to the x, y, z axis

Question 7

what is apparatus is known as the vestibular organ

Answer 7

peripheral sensory apparatus

Question 8

what does the peripheral sensory appartus do

Answer 8

detects and relays info about head angular and linear velocity to central processing system
orientates the head with respect to gravity

Question 9

what does the central processing system do

Answer 9

processes info in conjunction with other sensory inputs for position and movement of head in space

Question 10

what does the motor output system do

Answer 10

generates compensatory eye movements and compensatory body movements during head and postural adjustments

Question 11

vestibular organ
labyrinth = ___________+_______

Answer 11

vestibular organ + cochlea

Question 12

what is the function of the semi-circular canals (in ear)

Answer 12

detect head movement via rotatory acceleration

Question 13

in the semicircular canal what is the crista

Answer 13

sheet of cells where hair cells are clustered

Question 14

in the semicircular canals, what is the ampulla

Answer 14

bulge along canal, contains crista (sheet of cells)

Question 15

in the semicircular canal, what is the cilia

Answer 15

project into gelatinous cupula

Question 16

in the semicircular canals what is the kinocili

Answer 16

orientated in same direction so all excited or inhibited together

Question 17

what are the semicircular canals filled with

Answer 17

endolymph

Question 18

in the semi circular canals, movement causes endolymph fluid to

Answer 18

circulate and displace cupula

Question 19

what do otolith organs sense

Answer 19

linear acceleration and gravity

Question 20

what is the otolith organs made up of

Answer 20

saccule and utricle

Question 21

what do the utricle and saccule make up

Answer 21

otolith organs

Question 22

what does the saccule sense

Answer 22

movement in the vertical/saggital plane

Question 23

what does the utricle sense

Answer 23

movement in the horizontal plane

Question 24

in the otolith organs, what are otoconia

Answer 24

crystals of calcium bicarbonate

Question 25

what does striola do

Answer 25

serves as a structural landmark and arranges otoconia into narrow trenches dividing into otolith

Question 26

the signals in the vestibular nerve are (tonic/hasic)

Answer 26

tonic

Question 27

what are the 3 vestibular reflexes

Answer 27

vestibulo-ocular reflex
vestibulo-colic reflex
vestibular-spinal reflex

Question 28

what is the vestibulo-ocular reflex

Answer 28

keeps the eyes still in space when the head moves

Question 29

what is the vestibulo-colic reflex

Answer 29

keeps the head still in space - or on a level plane when you walk

Question 30

what is the vestibulo-spinal reflex

Answer 30

adjusts posture for rapid changes in position

Question 31

what does the vestibulo ocular reflex cause your eyes to do in head movement

Answer 31

eyes move in the opposite direction to head
speed of the eye movement equals that of head movement
allows objects to remain in focus during head movement

Question 32

if you move your head to the left, you will (excite/inhibit) the left horizonal canal, (exciting/inhibiting) the right

Answer 32

if you move your head to the left you will EXCITE the left horizontal canal, INHIBTING the right