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Premotor neuronal organization of horizontal rapid eye movements. Kaoru YOSHIDA 1 1Department of Physiology, Institute of Basic Medical Sciences, University of Tsukuba pp.286-301
Published Date 1986/4/10
DOI https://doi.org/10.11477/mf.1431905782
  • Abstract
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 Rapid advances have been made in understanding of the substrate for the control of eye movements. Specifically, a fair amount of informationsabout the neural connectivity among the functionally identified neurons has been accumulated by recent studies employing electrophysiological techniques such as systematic microstimulation and spike-triggered averaging or morphological technique such as intracellular injection of horseradish peroxidase. This review traces recent development of experimental findings on brainstem organization participating horizontal conjugate eye movements in cats, with emphasis on immediate premotor neurons directly contributing to motoneuronal activities.

 Horizontal conjugate eye movements involve the well coordinated action of two antagonistic pairs of the medial and lateral rectus muscles. During rapid eye movement, abducens motoneurons on one side exhibit a burst of high frequency discharge, while abducens motoneurons on the other side show an abrupt pause of spike activity. The burst is caused by a sudden production of EPSPs and in part by a decrease in preexisting IPSPs. The pause is caused by an abrupt generation of IPSPs and in part by a decrease of EPSPs. At least four groups of immediate premotor neurons participate in these post-synaptic potential changes, i.e., excitatory and inhibitory reticular burst neurons and excitatory and inhibitory secondary vestibular neurons.


Copyright © 1986, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1243 印刷版ISSN 0001-8724 医学書院

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