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Intracellular analysis of synaptic potentials induced in trigeminal jaw-closer motoneurons by pontomesencephalic reticular stimulation during sleep and wakefulness

Intracellular analysis of synaptic potentials induced in trigeminal jaw-closer motoneurons by... SCOTT H. YOSHIO by MICHAEL H. CHASE Institute, Departments of Physiology Anatomy the Brain Research University of California, Los Angeles, California 90024 SUMMARY CONCLUSIONS 1. The chronic intracellular recording technique in unanesthetized but head-restrained cats was utilized to analyze the effects of pontomesencephalic reticular formation (PMRF) stimulation on trigeminal jaw-closer motoneurons during naturally occurring states of sleep wakefulness. 2. During wakefulness quiet sleep, short pulse-train PMRF stimulation induced a poly depolarizing potential of long duration (20-80 ms) in jaw-closer motoneurons. During active sleep, the identical stimulation of the PMRF that was used during wakefulness quiet sleep produced a poly hyperpolarizing potential in the same cells. 3. The membrane potential of the cells was altered by current injection during PMRF stimulation to determine the nature of the induced potentials. The depolarizing potential of wakefulness quiet sleep was characterized as an excitatory post potential (EPSP), while the hyperpolarizing potential of active sleep was characterized as an inhibitory post potential (IPSP). 4. The IPSP induced in jaw-closer motoneurons by PMRF stimulation during active sleep was compared to the IPSP induced by inhibitory inputs from the intraoral region with respect to their sensitivities to polarizing current Cl- diffusion from the recording micropipette. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Neurophysiology The American Physiological Society

Intracellular analysis of synaptic potentials induced in trigeminal jaw-closer motoneurons by pontomesencephalic reticular stimulation during sleep and wakefulness

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Publisher
The American Physiological Society
Copyright
Copyright © 1980 the American Physiological Society
ISSN
0022-3077
eISSN
1522-1598
Publisher site
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Abstract

SCOTT H. YOSHIO by MICHAEL H. CHASE Institute, Departments of Physiology Anatomy the Brain Research University of California, Los Angeles, California 90024 SUMMARY CONCLUSIONS 1. The chronic intracellular recording technique in unanesthetized but head-restrained cats was utilized to analyze the effects of pontomesencephalic reticular formation (PMRF) stimulation on trigeminal jaw-closer motoneurons during naturally occurring states of sleep wakefulness. 2. During wakefulness quiet sleep, short pulse-train PMRF stimulation induced a poly depolarizing potential of long duration (20-80 ms) in jaw-closer motoneurons. During active sleep, the identical stimulation of the PMRF that was used during wakefulness quiet sleep produced a poly hyperpolarizing potential in the same cells. 3. The membrane potential of the cells was altered by current injection during PMRF stimulation to determine the nature of the induced potentials. The depolarizing potential of wakefulness quiet sleep was characterized as an excitatory post potential (EPSP), while the hyperpolarizing potential of active sleep was characterized as an inhibitory post potential (IPSP). 4. The IPSP induced in jaw-closer motoneurons by PMRF stimulation during active sleep was compared to the IPSP induced by inhibitory inputs from the intraoral region with respect to their sensitivities to polarizing current Cl- diffusion from the recording micropipette.

Journal

Journal of Neurophysiology – The American Physiological Society

Published: Aug 1, 1980

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