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A STUDY OF EXCITABILITY CHANGES IN DSCT NEURONS OF THE CAT Satoru Kubota 1 , Keiichi Amano 1 , Kōiti Kitamura 1 , R. E. Poppele 2 1Dept. of Neurosurgery, Neurological Institute, Tokyo Women's Medical College and Lab. of Neurophysiology 2Dept. of Physiology, University of Minnesota pp.1189-1197
Published Date 1977/11/1
DOI https://doi.org/10.11477/mf.1406204158
  • Abstract
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Excitability changes in the dorsal spinocerebellartract (DSCT) neurons of the cat were extracellularlystudied with correlation analysis.

Most of the interval histograms were classifiedas normal distribution, and occasionally bimodaldistributions were observed, which resulted froman occasional "double spiking" in the spontaneousbackground discharge (BD).

The conduction velocity was measured in 72DSCT fibers. The histogram showed a peak at40-50 M/S.

The majority of the units had BD with coef-ficient of variation less than 0.2, which suggestBD with regular firing.

Based on cross-correlelograms, DSCT responsesto electrical stimulation of the muscle nerves ofthe hind leg were classified into at least threetypes. Type 1 response, constituted approximatelyone-fifth of the total, is monosynaptic activation.Type 2 response, observed most frequently (47%),is inhibition of DSCT cells with a short latency.Type 3 responses, observed nearly as often as type2 (34%), is a long latency excitation, undoubtedlypolysynaptic.

Changes in stimulation intensity showed complexchanges in the pattern of response.

Type 1 and 2 responses were unaffected by in-creasing stimulus rate. Peak correlations in type3 response were reduced by increase in stimulusrate.

There were no data demonstrating feedbackcircuitry associated with collaterals of DSCT axons.This suggests that axon collaterals have no directeffect on the activity of DSCT cells.


Copyright © 1977, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 2185-405X 印刷版ISSN 0006-8969 医学書院

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