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KMID : 1036520150050010004
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Clinical Neuro-Ophthalmology
2015 Volume.5 No. 1 p.4 ~ p.7
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Saccadic System
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Kim Hyun-Ah
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Abstract
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Saccade is a quick, simultaneous movement of both eyes between two phases of fixation in the same direction. The amplitude of a saccade is determined by the activity in the lower motor neurons within the three oculomotor nuclei. The direction of a saccade is determined by which muscles are activated, as dictated by the activity in the premotor neurons within two separate gaze centers in the brainstem. The paramedian pontine reticular formation (PPRF) next to the abducens nucleus is the horizontal gaze center, and the rostral interstitial nucleus (rostral iMLF) in the midbrain reticular formation near the oculomotor nucleus is the vertical gaze center. The superior colliculus, the cortical eye fields, the basal ganglia and the cerebellum are working as higher-level controllers of the brainstem saccadic pulse generator.
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KEYWORD
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Saccade, Pulse and step, Burst neuron
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