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Electrophysiological study of the hypothalamic projection of noxious afferents from the dental pulp


, : Electrophysiological study of the hypothalamic projection of noxious afferents from the dental pulp. Fiziologicheskii Zhurnal (Kiev) 30(5): 579-586

Noxious evoked potentials to electrical stimulation of dental pulp were recorded from lateral and medial areas of the posterior, tuberal and anterior hypothalamus in cats anesthetized with the mixture of choralose and nembutal (45 and 15 mg/kg, respectively). In case of monopolar recording responses of the maximal amplitude and shortest latency were recorded in the posterior hypothalamus (focus of maximal activity). In the tuberal hypothalamus the noxious evoked potentials had a somewhat longer latency and a lower amplitude. In the anterior hypothalamus the responses had the lowest amplitude and longest latency. In case of bipolar recording evoked potentials of maximal amplitude and shortest latency were also localized in the posterior hypothalamus. Throughout the lateral hypothalamus nociceptive responses were of shorter latency than the potentials of medial hypothalamic structures. Hypothalamic nociceptive response were suppressed at low frequency of stimulation (1.25/s) and were characterized by a long recovery cycle (1500 ms). In microelectrophysiological experiments, the nociresponsive neurons of the posterior hypothalamus were found to receive convergence input from nonnociceptive A.beta. afferents of the sciatic nerve.

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