Oculomotor Lec26 Flashcards

(34 cards)

1
Q

purpose of the Vestibular Ocular Reflex.

A

steady the scene against movement

keep focus on object

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2
Q

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

A

opposite

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3
Q

purpose of OptoKinetic Nystagmus

A

. The eyes can jump focus

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

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4
Q

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

A

fovea

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5
Q

the ___ decides where saccades should go

A

forebrain

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6
Q

Vergence and Accomodation. Adjust the

A

plane of focus

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7
Q

___ Eye Field controls voluntary eye movements

A

Frontal

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8
Q

___Cortex controls involuntary pursuit movements

A

Superior Parietal

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9
Q

Vertical gaze center/saccade generator is in the

A

midbrain, near CN 3 and 4

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10
Q

Horizontal gaze center is in the

A

PPRF (paramedian pontine reticular formation), near CN 6

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11
Q

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

A

contralateral CN 3

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12
Q

Oculomotor Apraxia = lesion to

A

frontal eye fields

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13
Q

Oculomotor Apraxia leads to loss of

A

voluntary eye movements

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14
Q

___ is preveserved with oculomotor apraxia

A

VOR

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15
Q

with oculomotor apraxia cant _____ but can ____

A

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

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16
Q

Internuclear Ophthalmoplegia = ___ lesion.

17
Q

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

18
Q

sx of CN 6 palsy

A

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

19
Q

A saccade requires (2)

A
  1. both a “burst” of firing to overcome inertia and initiate eye movement
  2. a new “tonic” firing rate to maintain the new position:
20
Q

Motor Error: difference between ___ and ___

A

current visual
field and where you want to look

21
Q

baby
whose eyes kept moving was

A

Opsoclonus = Loss of frontal lobe Pause cells..

22
Q

Opsoclonus = Loss of___

A

frontal lobe Pause cells..

23
Q

Partial Burster Loss is due to damage to the

24
Q

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

A

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
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
33
problem with integrator results from damage to the
cerebellum
34
loss of pause cells results in
chaotic saccades