Involvement of the ventrolateral medulla in the mediation of pressor responses of the rat to afferent vagal stimulation.
Electrical stimulation of afferent vagal fibres evoked a pressor response in rats after transection of the spinal cord. The pressor response was accounted for by an increased release of vasopressin because it was abolished by the intravenous injection of a vasopressin antagonist. Bilateral electrolytic lesions at the sites of the caudal ventrolateral medulla markedly reduced the pressor response to afferent vagal stimulation but not that to carotid occlusion. It is concluded that the area of the caudal ventrolateral medulla is involved in mediation of the vasopressin-induced pressor response to afferent vagal stimulation.
Kubo
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D000818:Animals; D001794:Blood Pressure; D004558:Electric Stimulation; D005971:Glutamates / Q000494:pharmacology; D018698:Glutamic Acid; D006339:Heart Rate / Q000187:drug effects; D006584:Hexamethonium Compounds / Q000494:pharmacology; D008297:Male; D008526:Medulla Oblongata / Q000502:physiology*; D009475:Neurons, Afferent / Q000502:physiology*; D051381:Rats; D011919:Rats, Inbred Strains; D014630:Vagus Nerve / Q000502:physiology
D005971:Glutamates; D006584:Hexamethonium Compounds; D018698:Glutamic Acid