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104. Jahrestagung der Deutschen Ophthalmologischen Gesellschaft 2006
Abstract
Abstract
SA.05.12 The role of the cerebellum in the control of eye movements Steffen H.
Universitäts-Augenklinik, Bayerische Julius-Maximilians-Universität Würzburg The cerebellum has a fundamental role in the control of eye movements. It has the property to adapt for saccades, smooth puirsuit and the vestibulo-ocular reflex (VOR) within a certain range. Structures important for control and adaptation include the vestibulocerebellum (flocculus, paraflocculus, nodulus and ventral uvula) and the dorsal vermis with the underlying nucleus fastigii. Though the flocculi mainly contribute to the control of the VOR the paraflocculi are involved in the control of smooth pursuit eye movements. Nodulus and ventral uvula account fort he velocity storage of the vestibulo-ocular reflex. A lesion of these structures will pathologically enhance the velocity storage mechanism, a phenomenon that may manifest as acquired periodic alternating nystagmus. A lesion of the dorsal vermis and/ore the underlying nucleus fastigii will lead to a prominent saccadic dysmetria. In addition to these eye movements disorders, a cerebellar lesion may also lead to a weakness of convergence, a decompensating esophoria and a skew deviation. Structures responsible for these binocular troubles and misalignments may be the cerebellar hemispheres, the flocculi and the dorsal vermis.
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