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J Neurophysiol 53: 429-434, 1985;
0022-3077/85 $5.00
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Journal of Neurophysiology, Vol 53, Issue 2 429-434, Copyright © 1985 by APS

ARTICLES

Sensory processing in a thermal afferent pathway

S. N. Davies, G. E. Goldsmith, R. F. Hellon and D. Mitchell

Extracellular recordings were made from cold-receptive afferent fibers in the trigeminal ganglion of rats anesthetized with halothane. By applying a standardized series of steady or changing temperatures to the receptive fields, we recorded the static and dynamic responses of the afferents. Comparable recordings were made from neurons in the marginal layer of the caudal trigeminal nucleus onto which the cold fibers synapse. The static and dynamic responses of the afferent fibers were reproduced faithfully by the second-order neurons, but at a much higher level of activity. Ganglionectomy silenced the second-order cells. Their continuous high level of activity appears to depend on the tonic input from the afferent fibers and not on any intrinsic circuits in the medulla.


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