The Origin of Impulses Recorded from Dentinal Cavities in the Tooth of the Cat

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Abstract
Intradental nerve impulse activity can be recorded by means of electrodes inserted into dentinal cavities in the tooth of the cat. The following study has been conducted to investigate the origin of this impulse activity. The results suggest that the fibres from which the impulses are recorded must pass through the major part of the pulp between the recording electrodes. Furthermore, the results show that it is not possible to record discharges in the finest terminal branches in the pulpo-dentinal border zone using the present technique. However, the data obtained indicate that these terminal branches were activated during stimulation resulting in recordable propagated axonal impulses.