カニクイ猿の乳歯歯根膜の神経分布に関する研究

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The periodontal innervation of primary teeth in Macaca irus was examined by light-microscopy. The results were as follows : 1. The nerve fibers distributed in the periodontium of primary teeth in Macaca irus were derived from two directions. The first group of nerve fibers entered the periodontium by passing through the angioneurotic canal of the bottom of the bony socket, and the second group of them entered it passing through some bony canaliculus at the lateral wall of the bony socket in the various height of the periodontium. 2. Nerve supply was the richest in the apical one-third of the tooth root, rich in the middle third, and very poor in the cervical portion. 3. Most of the nerve fibers distributing the periodontium of primary teeth were accompanied by blood vessels. Many myelinated nerve fibers in the periodontium branched and ramified repeatedly, and gradually became unmyelinated nerve fibers. 4. Nerve endings in the periodontium of primary teeth could be classified into the two types by their structure. One type was pointed free nerve endings, and the other type was thick knob-like endings closely resembling Meissner's tactile corpuscles. Both of two types were concentrated near the apical one-third of the tooth root. 5. Pointed free nerve endings terminated in the periodontal ligament, fibrocyte and some of them reached cementoblast and under the cementoblastic layer, but none of them entered the cementum. Most of the thick knob-like endings terminated under the cementoblastic layer. 6. In the vascular connective tissue which filled physiologic absorption area of primary teeth, regressive changed nerve fibers were often found, while just normal nerve fibers were also found.
九州歯科学会の論文
1986-12-25

カニクイ猿の乳歯歯根膜の神経分布に関する研究

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