Neurophysiological Response of Single Receptor Units in the Tooth of the Cat

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Abstract
Two platinum wire electrodes placed on the exposed dentine of the canine tooth of the cat permitted recording single receptor responses using conventional electrophysiological technique. Individual receptors were excited principally by thermal stimuli applied to the intact enamel surface. Single units were found to respond either to heat or cold. Responses recorded during cooling and rewarming showed no simple relation between frequency and temperature but most units were only excited within restricted limits of a few degrees. Responses in cold sensitive units frequently showed a prepotential associated with the diphasic spike which appeared to be related to the receptor process and the excitability of the sensory ending.

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