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Oculomotor Systems

Oculomotor Systems. S. J. Potashner, Ph.D sjp9713@neuron.uchc.edu. Eye Motor Systems. Control tears & blinking – protects the eye surface Control pupils – light compensation; sympathetic response Control gaze & lens curvature – moves eyes onto a target Saccades Smooth pursuit

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Oculomotor Systems

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  1. Oculomotor Systems S. J. Potashner, Ph.D sjp9713@neuron.uchc.edu

  2. Eye Motor Systems • Control tears & blinking – protects the eye surface • Control pupils – light compensation; sympathetic response • Control gaze & lens curvature – moves eyes onto a target • Saccades • Smooth pursuit • Vergence • Control gaze during head movement – stabilize eyes on target

  3. Pupillary Control System Parasympathetic Stimulus: light Response: pupil constricts video Sympathetic Stimulus: an event or memory Response: pupil dilates, lids open wider video

  4. Eye Movements Fixation holds foveas still Saccade shifts both foveas to an alternate target Smooth pursuit keeps both foveas on a moving target Vergence keeps both foveas on an approaching or receding target Optokinetic keeps both foveas on target during head movement

  5. Control of Horizontal Saccadic Eye Movements video

  6. Control of Vertical Saccadic Eye Movements video

  7. Upper Motor Neurons That Control Saccads Voluntary pathway Reflexive pathways

  8. Eye Movements Fixation holds foveas still Saccade shifts both foveas to an alternate target Smooth pursuit keeps both foveas on a moving target Vergence keeps both foveas on an approaching or receding target Optokinetic keeps both foveas on target during head movement

  9. Control of Smooth Pursuit Eye Movements video

  10. Control of Vergence Eye Movements • Convergence • Activation of both • medial rectus muscles • Lens curvature increased • Pupil constricts Divergence ? video

  11. Control of Vergence Eye Movements

  12. Interaction of Vergence and Saccades vergence during saccade saccade vergence after saccade vergence before saccade

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