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[Recording intracellular potentials of viscero-nociceptive neurons in posterior group of thalamic nuclei (PO) and their labeling with HRP intracellularly in cats].

Intracellular potentials (ICP) of the neurons in PO evoked by stimulating greater splanchnic nerve (GSN) were recorded in 42 cats. The resting potentials and action potentials induced by stimulating GSN were 53.74 +/- 11.68 mV and 29.44 +/- 9.22 mV respectively. Owing to intensity of the stimulation we can record EPSP and single spike or polyspikes on it. The action potentials derived from stimulating GSN (related action potentials) were inhibited by injection of morphine intravenously. On the basis of recording ICP, we also labeled 2 related neurons with stimulation of GSN and 2 unrelated ones. Differences between two kinds of the neurons were compared preliminarily. The ICP of the related neuron with stimulating GSN were inhibited by stimulating Amygdala too. Factors influencing amplitude of action potential in intracellular recording, criteria of determining nociceptive neuron and inhibition derived from stimulating Amygdala were also discussed.