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Evoked potentials have been recorded at the cortex of the curarized cat following stimulation of the tooth pulp. The majority of the afferent potentials have been classified into two main categories: A) short-latency potentials from the contralateral tooth only, which were unaffected by the administration of a mixture of nitrous oxide and oxygen. These responses were observed in the ventral portion of the coronal gyrus. B) Potentials with longer latencies than those of A, which were evoked by stimulation of both the ipsilateral and contralateral teeth and which were markedly diminished in amplitude by the nitrous oxide mixture. The main source of these potentials was an area rostral to, and overlapping with, the area at which the short-latency contralateral potentials were recorded. They were also observed in the ventral portion of the anterior ectosylvian gyrus. The functional characteristics of the potentials in categories A and B are such as to suggest that these potentials represent tooth pulp projections to the cortex by way of the trigeminal lemniscus and the trigemino-bulbo-thalamic tracts, respectively.

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