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Japanese

Experimental Studies on the Effect of Pyrithioxin on the Trigeminal Nervous System Yojiro KAWAMURA 1 , Toshifumi MORIMOTO 1 , Mitsuru TAKATA 1 , Kiyokatsu MIYOSHI 1 1Dept. of Oral Physiology, Dental School, Osaka University pp.1289-1296
Published Date 1969/11/1
DOI https://doi.org/10.11477/mf.1406202636
  • Abstract
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The present study was performed to evaluate effects of pyrithioxin on the function of trigeminal sensory and motor nuclei of the cat. The outline of the results were as follows.

1. Intravenous administration of pyrithioxin (40 mg/kg) inhibited the jaw opening reflex. This inhi-bitory phenomenon consisted of the two phases of the initial inhibition and of the delayed inhibition. These effects of pyrithioxin are assumed to be caused by inhibition of a polysynaptic reflex system from the trigeminal sensory nucleus to the motor nucleus, and it was determined that the trigeminal sensory nucleus and motor nucleus themselves were not affected at all by this chemicals.

2. The jaw jerk reflex was also influenced by pyrithioxin. But contrary to the effects on the jaw opening reflex, the jaw jerk reflex showed initial facilitation-inhibition-delayed facilitation. Also du-ring the phase of the initial inhibitory effect of the jaw opening reflex, respiratory movement and muscle tensions were influenced. These facts may also indicate the possible influence of this chemicals to the function of the brain stern reticular forma-tion.


Copyright © 1969, 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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