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EYE MOVEMENTS NBIO 401 Monday, November 22, 2010 Ric Robinson
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Objectives: -Be able to describe the neural pathway of the VOR, i.e., the pathway through which vestibular information contracts eye muscles. (labyrinth - vestibular nuclei - oculomotor neurons.) -Be able to explain why the VOR is important to clear vision. -Be able to explain how putting cool or warm water into the ear elicits eye movements. -Be able to explain how optokinetic nystagmus aids the VOR. -Be able to describe the characteristics of the 6 types of eye movements we make (counting fixation as an “eye movement”). -Be able to characterize the changes in accommodation that always accompany vergence and what purpose combined vergence and accommodation serve. -Be able to describe the neural pathways underlying each of the 6 types of eye movements. -Be able to characterize the map of visual and motor space on the surface of the superior colliculus (SC). -Be able to describe the spatial to temporal transformation in saccade processing. - Be able to explain the reciprocal relationship between the activity in the substantia nigra pars reticulata and the SC. What is the caudate doing during a saccade?
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Opsoclonus - young baby
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Caloric Testing
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Smooth Pursuit Pathways
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Saccade Example
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Saccade Pathways
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Pre Motor Network for Horizontal Saccades Pre Motor Network for Vertical Saccades
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Abducens Nucleus
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SNr and Superior Colliculus Activity During a Saccade
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