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24 Cards in this Set
- Front
- Back
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What is the portion of a "cranial Nerve" while in the brainstem called?
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Fascicle
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Damage to a cranial nerve after the nucleus is called what?
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Infranuclear disorder
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What pathways (general) coordinate yoke muscle movement by connecting EOM nuclei?
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Internuclear pathway
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Put in the correct order:
Gaze center Supranuclear pthwy Internuclear pthwy |
Supranuclear > Interniclear > Gaze Center
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Pursuits, saccades, vestibular ocular reflex, optokinetix reflex, vergence, and fixations are all part of what kind of systems?
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Supranuclear ocular motility systems
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While Dean is running from a rabid dog, he can still turn around and see the dog the that is chasing him. What systems allow him to see the dog while his head is bobbing up and down?
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VOR and OKN compensate for head movements
(vestibular oc and optokinetic) |
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Lars is unable to move his eyes to look at a fixation bead to his left, but he can follow the bead from the center to his left. No EOM damage. What could be wrong with Lars?
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Damage to frontal eye feilds.
Transitory unless Sup Colloculi are also damaged which is rare. |
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The frontal eye fields connect to where?
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PPRF and superior colliculi
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Lars would like to move his eyes to the left, what is the pathway starting from the frontal eye fields that will enable him to do so?
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Left Frontal eye fields > PPRF (horiz gaze center) >
1. CN VI to LLR 2. CN III nuc to RMR |
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What is the function of the horizontal gaze center (PPRF)
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Causes ipsilateral horizontal gaze
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Lars cannot move his eyes to the a fixation bead in his left field or follow a bead to the left. What may Lars be suffering from assuming he has normal EOM's?
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Gaze Palsy, PPRF lesion
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Which Supranuclear nucleus controls upgaze?
contra or ipsi? |
Lateral riMLF=rostral interstitual MLF
CONTRA |
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Which Supranuclear nucleus controls downgaze?
contra or ipsi? |
Medial riMLF=rostral interstitual MLF
IPSI |
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Val has trouble with her verical gaze, near light dissociation, and a convergence retraction nystagmus. What syndrome may Val have and what might have caused this syndrome?
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Dorsal Midbrain Syndrome=Parinauds, sylvian aqueduct syndrome.
Caused by MS, pinealoma, stroke, aqueduct stenosis(narrow) |
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Skew deviation (Small vertical relatively comitant tropia) results from what?
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Brainstem or cerebellar injury
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If a pursuit and a saccade where in a race, who would you bet on?
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The saccade!
Saccades are faster than pursuits |
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saccades:
Define normometric |
Single accurate movement
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saccades:
Define Hypometric |
Undershoot (pulseless)
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Saccades:
Define Hypermetric |
Overshoot (think cerebellar disease
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the peristriate cortex, association areas, posterior limb internal capsule, pons, and cerebellar flocculus are important to what type of eye movement?
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Pursuits
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To be a saccade, an eye movement may not move more than how many degrees?
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15 degrees
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Which eye movement moves with a "pulse-step" ?
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Saccades
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What do burst cells do?
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produce pulse to over come inertia to produce a saccade.
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Why dont we see the background move during a saccade?
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Corollary discharge signal, Efferent copy "will to effort"
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