Projection of tooth pulp afferents to the thalamus of the cat. I. Focal potentials and thalamocortical connections

Experimental Brain Research
B RydenhagS Andersson

Abstract

Electrical stimulation of tooth pulp afferents in cats evoked short latency focal potentials in the basal ventromedial nucleus of thalamus (VMB), in the border zone between this nucleus and the arcuate nucleus of the ventrobasal complex (VBA), and in the marginal zone of VBA and the external nucleus of the ventrobasal complex (VBX). No responses were found in the centre of VBA and VBX. Very few responses were found in the intralaminar region. The projection from the tooth pulps was bilateral, but the best responses following stimulation of the ipsi- and the contralateral tooth pulps could be evoked at slightly different locations within VMB. The mean latency of the responses was shorter following stimulation of the contralateral tooth pulp than following stimulation of the ipsilateral one. Electrical stimulation in VMB, VBA, and VBX evoked focal potentials in thalamocortical projection fibres, which were recorded from in the white matter below areas SI and SII after decortication by suction. Conditioning stimulation of the tooth pulps suppressed these responses within 200 ms if the stimulating electrode was placed at the border between VBA and VMB, suggesting that tooth pulp stimulation activates a thalamocortical projection wi...Continue Reading

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Citations

Dec 1, 1989·Acta Physiologica Scandinavica·B C ShyuB Rydenhag
Sep 1, 1992·Acta Physiologica Scandinavica·B OlaussonS Andersson
Jun 1, 1995·Cephalalgia : an International Journal of Headache·H Angus-LeppanG A Lambert

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