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[Electron microscopic observation of the pulpal nerves in some mammals].

In order to define the biological significance of the double innervation in the tooth pulp, architectonic observations of the pulpal nerves were made electron microscopically on the teeth of the tupaias, monkeys and rats. The results obtained are as follows: 1. The architectonic features of the pulpal nerves are similar to each other in the teeth of the tupaia and monkey and rat molars, consisting of many myelinated fibers and some unmyelinated fibers. 2. They have no special anatomical relation to the blood vessels. 3. In the apical pulp of the constantly growing rat incisor, all of the nerve fibers are unmyelinated, and they were classified into the polyaxonal and monoaxonal fibers. 4. In the upper part of the incisor pulp the nerve fibers were classified into the myelinated monoaxonal and unmyelinated polyaxonal fibers. 5. In the denervated pulp it was shown that the monoaxonal unmyelinated and the myelinated fibers are derived from the trigeminal ganglion cells and the polyaxonal unmyelinated fibers from the cervical sympathetic ganglion cells. 6. The biological significance of the double innervation of the pulp was discussed: the sympathetic nerve may act as an inhibitor of the aging of pulp and the trigeminal nerve as the excitor of the dentine formation as well as the conveyor of the pulpal sensation.