Oculomotor Lec26 Flashcards Preview

Neuroscience > Oculomotor Lec26 > Flashcards

Flashcards in Oculomotor Lec26 Deck (34):
1

purpose of the Vestibular Ocular Reflex.

 steady the scene against movement

keep focus on object

2

 Vestibular Ocular Reflex. The eyes move ___ of how the head moves to
keep focus on an object 

opposite

3

purpose of OptoKinetic Nystagmus

. The eyes can jump focus

ex. switching targets as we
walk - also steadies the scene against movement

4

Saccades. Fast eye movements to shift the visual scene onto the ___

fovea

5

the ___ decides where saccades should go

forebrain

6

Vergence and Accomodation. Adjust the

 plane of focus

7

___ Eye Field controls voluntary eye movements

Frontal

8

___Cortex controls involuntary pursuit movements

Superior Parietal 

9

Vertical gaze center/saccade generator is in the 

midbrain, near CN 3 and 4

10

Horizontal gaze center is in the

 PPRF (paramedian pontine reticular formation), near CN 6

11

The MLF, medial longitudinal fasciculus, gets both eyes to move together by activating the

 contralateral CN 3

12

 Oculomotor Apraxia = lesion to 

frontal eye fields 

13

Oculomotor Apraxia leads to loss of 

voluntary eye movements

14

___ is preveserved with oculomotor apraxia

VOR

15

with oculomotor apraxia cant _____ but can ____

can’t “look right” on command but can still follow a finger to the right

16

Internuclear Ophthalmoplegia = ___ lesion.

MLF

17

with ___ lesion R. eye will not adduct when asked to look left voluntarily, but can move when
following a finger 

MLF

18

sx of CN 6 palsy 

the eye can’t move laterally, either voluntarily or involuntarily

19

A saccade requires (2)

1.  both a “burst” of firing to overcome inertia and initiate eye movement

2.  a new “tonic” firing rate to maintain the new position:

A image thumb
20

Motor Error: difference between ___ and ___

current visual
field and where you want to look

21

baby
whose eyes kept moving was

Opsoclonus = Loss of frontal lobe Pause cells..

22

Opsoclonus = Loss of___

 frontal lobe Pause cells..

23

Partial Burster Loss is due to damage to the

medulla

24

Partial Burster Loss (damage to medulla) results in what sx

slowed saccades 

25

Loss of Cerebellar Integrator  causes what dsx

 can look R. or L, but
can’t hold the new position.

26

foveal pursuit involves keeping the object on the fovea.

what is moving.. the head or the eyes?

the eyes are moving

27

bilateral oipthalmoplegia.. only one of the things that is nml is ___

convergence

28

pursuit movements use the

parietal lobe

29

mlf X
the eye moving ___
will be slow

inward

30

adducting the eye is slow... always going to be

MLF

31

problem with burst cell position 

slowed saccades, might not hold position

A image thumb
32

problem with integrator
what would result?

new tonic firing rate wouldnt be there
so it would drift back

makea  saccade
but wont hold
with cerebellar disease

A image thumb
33

problem with integrator results from damage to the

cerebellum

34

loss of pause cells results in

Q image thumb

chaotic saccades