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Responses of neurons in the rat ventral posterior lateral thalamic nucleus to noxious visceral and cutaneous stimuli

Published online by Cambridge University Press:  13 October 2005

JIRI PALECEK
Affiliation:
Department of Neuroscience and Cell Biology, University of Texas Medical Branch, Galveston Institute of Physiology ASCR, Praha 142 20, Czech Republic
WILLIAM D. WILLIS
Affiliation:
Department of Neuroscience and Cell Biology, University of Texas Medical Branch, Galveston

Abstract

Visceral nociceptive responses to distention of the ureter, and responses to innocuous and noxious mechanical stimulation of the skin were recorded from neurons in the ventral posterior lateral nucleus of the thalamus in anesthetized rats. The ventral posterior lateral (VPL) neurons were classified by their responses to cutaneous stimuli as either low-threshold or wide-dynamic-range neurons. No high-threshold neurons were found in the population of VPL neurons sampled. Some VPL neurons that responded to distention of the ureter appeared to lack a cutaneous receptive field. The majority of VPL neurons that responded to noxious visceral stimulation of the ureter were classified as low-threshold neurons, based on their responses to cutaneous stimuli. Transection of the DC at an upper cervical level dramatically reduced the responses of VPL neurons to ureter distention and to innocuous mechanical stimulation of the skin, but the responses to noxious mechanical stimulation of the skin remained intact. Ureter distention and mechanical stimulation of the skin might activate dorsal horn neurons, including postsynaptic dorsal-column pathway (PSDC) neurons and spinothalamic tract (STT) cells. We conclude that both the DC pathway and the STT are likely to contribute to the visceral and somatic responses of some VPL neurons.

Type
Research Article
Copyright
© 2005 Cambridge University Press

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