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ANALYSIS OF EFFECTS OF PYRAMID STIMULATION UPON SPINAL MOTOR REFLEXES, GALVANIC SKIN RESPONSE AND BLOOD PRESSURE Haruo Takamura 1 1Dept. of Neurosurgery, Hakkaido Univ. School of Medicine pp.401-409
Published Date 1963/4/1
DOI https://doi.org/10.11477/mf.1406201461
  • Abstract
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In order to investigate the function of the pyramidal tract, effects of pyramid stimula-tion upon flexor and extensor monosynaptic and polysynaptic reflexes and upon firing indexes of flexor and extensor motoneurones were analysed, either the peroneal or tibial nerve being stimulated.

Effects of pyramid stimulation upon galva-nic skin response and blood pressure were also observed.

For the pyramid stimulation, single pulse as well as repetitive stimulations were em-ployed.

It is characterized in the present experi-ment that procedures were taken to eliminate all the possible indirect effects of pyramid stimulation upon above noted phenomena due to current spread, through collaterals of the pyramidal fibres to the brain stem structures and through the gamma loop in the peri-phery.

As to the results, facilitatory effects of pyramid stimulation upon flexor motoneuro-nes were observed, whereas distinct in hibi-tory effects were recognized upon extensor motoneurones, although an initial facilitatory effect was obtained in some of extensor mo-toneurones following single pulse stimulation to the pyramid.

On the basis of these results, it was sug-gested that the pyramidal tract as a whole has a stronger facillitatory effect upon flexor motoneurones and that facilitatory fibres to the flexor motoneurones may exert reciprocal inhibitory effect upon extensor motoneuro-nes.

Neither galvanic skin response nor change in blood pressure was elicited by pyramid stimulation under the present experimimental conditions.


Copyright © 1963, 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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