A Study of Pulp-Nerve Excitation through a Silver-Wire Electrode

¹ Department of Physiology, Tokyo Medical and Dental University, Tokyo, Japan

The action potentials of the single nerve fiber in the pulp of the canine were recorded by silver-wire electrodes in cats.

The spontaneous discharges and the discharges elicited by mechanical as well as by thermal stimulation were recorded.

The antidromically conducted spikes were recorded by a monopolar silver-wire electrode on the pulp. Occasionally, a single stimulating pulse applied at the inferior alveolar nerve caused two spikes from the electrode on the pulp. Those two spikes were assumed to originate from the same unit.

The conduction velocity in the inferior alveolar nerve was 35 m/sec. As the nerve fiber entered the pulp, the conduction velocity slowed down to 8.9 m/sec. The conduction velocity in the pulp was measured by two pairs of bipolar electrodes, directly applied to the pulp.

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