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  • Title: [Reactions of the neurons of various hypothalamic structures to tooth pulp and sciatic nerve A beta-fiber stimulation in the cat].
    Author: Baklavadzhian OG, Darbinian AG, Taturian IKh.
    Journal: Neirofiziologiia; 1986; 18(2):171-80. PubMed ID: 3713911.
    Abstract:
    Responses of single units from lateral and medial areas of the posterior, tuberal and anterior hypothalamus to electrical stimulation of dental pulp and sciatic nerve A beta afferents were recorded in anesthetized curarized cats. 80.7%, 81.5% and 71.4% of units, respectively, responded to stimulation in posterior tuberal and anterior hypothalamus. The shortest latency of responses was recorded in the postero-lateral hypothalamus. Nociceptive responses in the lateral hypothalamus were of shorter latency than responses of medial hypothalamic units. Marked predominance of excitatory responses in the posterior hypothalamus and almost an equal proportion of excitatory and inhibitory responses in the tuberal and anterior hypothalamus were found. High degree of convergence (85.8%) of noxious and nonnoxious (sciatic nerve A beta afferents) impulses was revealed. Unidirectional, similar pattern of responses of convergent type neurons to stimulation of the tooth pulp and sciatic nerve A beta afferents indicate a nonspecific character of responses of the majority of polysensory neurons. 14.2% of hypothalamic units were monomodal, specific nociceptive neurons. Hypothalamic nociceptive units were characterized by a long recovery cycle (200-500 ms) and low reproducibility of responses to repetitive stimulation of the tooth pulp afferents (1.5-2/s). The neuronal organization of the nociceptive afferent system of the hypothalamus and the functional role of convergent and specific nociceptive neurons of the hypothalamus are discussed.
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