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KMID : 0352119920080030254
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Journal of Kyung Hee University
1992 Volume.8 No. 3 p.254 ~ p.258
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Responses of the Jaw Opening Reflex to Superior Colliculus Stimulation in Rats
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Abstract
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The aim of this study was to investigate the effects of electrical stimulation of superior colliculus on the jaw opening reflex. Rats were anesthetized with intraperitoneal urethane plus a-chloralose and placed in a stereotaxic instrument after
tracheostomy. To apply noxious stimuli, a pair of enameled wire was inserted into the tooth pulp of the low incisor. Bipolar stainless-steel electrodes were used for stimulation of the superior colliculus. The effects of conditioning was
estimated
the
degree of suppression of the digastric muscle electromyogram (dEMG) in the jaw opening reflex. Average intensity of tooth pulp stimulation for threshold of the jaw opeining reflex was 460±34μA. By electrical stimulation of superior colliculus
at
100
Hz ipsilaterally, the amplitude of dEMG was maximally suppressed to 73.4±11.1% of control level for 15-min stimulation. Responses of the jaw opening reflex were unaffacted by contralateral-stimulation of superior colliculus. From the results, it
was
concluded that trigeminal nucleus receive inhibitory inputs from superior colliculus. These connections may contribute to modulation of pain response and neural transmission in orofacial areas.
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KEYWORD
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