FUSIMOTOR UNIT ACTIVITIES AND NATURAL SLEEP IN THE CAT

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  • 久保田 競
    Department of Neurophysiology, Institute of Brain Research, Faculty of Medicine, University of Tokyo
  • 田中 励作
    Department of Neurophysiology, Institute of Brain Research, Faculty of Medicine, University of Tokyo

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1. Single fusimotor units of the VIIth lumbar ventral root were recorded in the unanesthetized chronic cat. In the discharge patterns of the spontaneous activity in the sleep with slow wave and spindle in EEG (ortho-sleep) and in the response patterns of the units by arousing stimuli such as pinna pinching, two extreme patterns of the fusimotor units were described. The fusimotor unit, having one of these patterns, was termed as kinetic (K) or tonic (T), respectively. During ortho-sleep the kinetic unit fired unsteadily or was silent while the tonic one fired regularly. By awakening, the kinetic unit started to, fire or increased the rate dynamically, while the tonic unit increased the rate slightly.<BR>2. During para-sleep, the spontaneous discharge decreased in rate in both kinetic and tonic units (tonic depression). There also occurred an appearance of the transient burst discharges, continuing for more than several sec in both tonic and kinetic units. The burst was more abrupt in the latter. In addition to the transient facilitation, there occurred a transient depression in the tonicunit. These transient facilitation and depression occassionally occurred during. rapid eye movement phase.

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