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ISSN : 1226-9654

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Vol.6 No.1

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Periaqueductal Gray is Involved in Descending Pain Inhibition Elicited by Stimulating Anterior Pretectal Nucleus in Rats

The Korean Journal of Cognitive and Biological Psychology / The Korean Journal of Cognitive and Biological Psychology, (P)1226-9654; (E)2733-466X
1994, v.6 no.1, pp.29-41
Bae-Hwan Lee (Department of Psychology, Korea University)
Hyun Kim (Department of Anatomy, College of Medicine, Korea University)
Young-Suk Suh (Department of Anatomy, College of Medicine, Korea University)
Seung-Kil Hong (Department of Physiology, College of Medicine, Korea University)
Chang-Yil Ahn (Department of Psychology, Korea University)
Ki-Suk Kim (Department of Psychology, Korea University)
Lee, B., Kim, H., Suh, Y., Hong, S., Ahn, C., & Kim, K. (1994). Periaqueductal Gray is Involved in Descending Pain Inhibition Elicited by Stimulating Anterior Pretectal Nucleus in Rats. The Korean Journal of Cognitive and Biological Psychology, 6(1), 29-41.

Abstract

This study was conducted to determine whether the periaqueductal gray (PAG) is involved in descending pain inhibition system mediated by the anterior pretectal nucleus (APTN). Pain sensitivity was assessed using tail-flick test to radiant heat in the rat anaesthetized with pentobarbital. Microinjections of lidocaine into the PAG inhibited the analgesic effects of stimulating the APTN. After WGA-HRP was injected into the ventral medulla at the level of the inferior olivary nuclei, the labeled neurons were detected in the ventrolateral PAG and in the APTN. The results suggest that the PAG is at least partially involved in a descending antinociceptive pathway originating in the APTN.

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The Korean Journal of Cognitive and Biological Psychology

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