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Flashcards in Vestibular Anatomy Deck (53)
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31

Which direction do eyes move with angular movement?

opposite

32

Pitch is sensed by what?

anterior/posterior canals

33

Yaw is sensed by what?

horizontal canals

34

Sensory organ of linear or translation VOR

Otoliths:Saccule and Utricle

35

Which direction do eyes move with linear movement?

opposite

36

What does the saccule detect?

Linear movement up and down (riding in elevator)

37

What does the utricle detect?

Linear movement horizontally (riding on a train on a straight track

38

Sensory organ of ocular tilt reflex:

Otolith:Utricle

39

What direction do eyes and head move in ocular tilt reflex?

opposite tilt of head

40

What does head tilt to the left cause?

elevation of the left eye, depression of the right eye, torsion of both eyes to the right and the tilt of the head on the body to the right.

41

What facial nerves does ocular motor nuclei travel for mediation of VOR?

III,IV,VI

42

What are the target for vestibular input?

Vestibular Nuclear Complex
The cerebellum

43

What does the cerebellum do?

back-up system for adaption of gain of VOR
Monitors vestibular performance and readjusts central vestibular processing if necessary

44

VOR (Vestibular Ocular Reflex):

generates eye movements, which enables clear vision while head is in motion

45

VSR (Vestibular Spinal Reflex):

generates compensatory body movement in order to maintain head and postural stability, thereby preventing falls

46

VCR (Vestibular Collic Reflex):

stabilizes the head in space

47

Function of vestibular system:

stabilizes vision when head moves (VOR)
balance control (VSR)

48

What does visual acuity depend on:

position of image on fovea
ability to hold image steady

49

Position of image: gaze shifting

for best vision, object within 0.5 of center of fovea
fovea must be moved to achieved proper poistion for vision
saccades, pursuits, vergence eye movement

50

Holding image steady, gaze holding

optokinetic, visual fixation, vergence and vestibular eye movements

51

Components of balance control:

gaze stabilization system
postural stabilization system

52

Gaze Stabilization System

maintains gaze direction of the eyes and visual acuity during activities involving active head and body movements

53

Postural Stabilization System

keeps the body in balance while an individual stands and actively moves in daily life