Examination of the afferent fiber responsible for the suppression of jaw-opening reflex in heat, cold, and manual acupuncture stimulation in rats

Brain Research
K OkadaK Kawakita

Abstract

The possible afferent fibers that participate in the inhibition of jaw-opening reflex (JOR) were examined using selective conduction blockade by topically applied capsaicin. Blood pressure, heart rate, and rectal temperature were monitored, and bilateral femoral nerves were denervated in thiamylal anesthetized Wistar rats. The sciatic nerves were exposed bilaterally and two cotton balls, one soaked with 1.5% capsaicin and the other with saline, were directly applied to the nerve trunk on the respective sides. We verified the conduction blockade of the compound action potentials A delta and C fibers by 1.5% capsaicin. The evoked activity of the digastric electromyography elicited by electrical stimulation of the tongue (1.5 x T, duration 200 microseconds, interval 2 ms, twin pulse, 0.2 Hz) was monitored. On the saline-treated side, the JOR was gradually inhibited by manual acupuncture stimulation of the ipsilateral hindpaw (80 s), and the effect continued after the cessation of the stimulus. This response was not obtained with the manual acupuncture stimulation on the capsaicin-treated side. Immersion of the hindpaw in hot water (53 degrees C, 40 s) induced a rapid and potent inhibition of the JOR on the saline-treated side, but...Continue Reading

Citations

May 2, 2014·Evidence-based Complementary and Alternative Medicine : ECAM·Xian ShiGerhard Litscher
Feb 6, 2017·Acupuncture in Medicine : Journal of the British Medical Acupuncture Society·Younbyoung Chae, Håkan Olausson
Jan 24, 1998·The International Journal of Clinical and Experimental Hypnosis·C R Chapman, Y Nakamura
Jun 27, 2006·Journal of Pharmacological Sciences·Kenji KawakitaKinya Kuriyama
Mar 29, 2012·Evidence-based Complementary and Alternative Medicine : ECAM·Xinyan GaoBing Zhu
Oct 16, 2015·Acupuncture in Medicine : Journal of the British Medical Acupuncture Society·Weidong GuZhaoxin Wang
Feb 22, 2000·Critical Reviews in Oral Biology and Medicine : an Official Publication of the American Association of Oral Biologists·B J Sessle
Oct 29, 2008·Evidence-based Complementary and Alternative Medicine : ECAM·Kaoru Okada, Kenji Kawakita
Apr 29, 2021·Journal of Pain Research·Mateusz Wojciech KucharczykKirsty Bannister

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