カニクイザルの下歯槽神経の線維構成に関する組織学的研究
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概要
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A total of 21 Macaca irus, seven each of young, young adults, and adults, were investigated for fiber formation of the inferior alveolar nerve. The inferior alveolar nerve together with the mandibular canal in each case was precisely cross-sectioned at a point proximal to the mandibular foramen, under the distal root of the mandibular first molar, and at a point distal to the mental foramen. The specimens were stained for axon and for myelin sheath and examined. The results were as follows : 1. Morphology of the cross sections of the mandibular canal was bucco-lingually depressed oval or semi-circle for the young, young adults, and adults. It was however vertically depressed oval, in two cases each, at the mandibular foramen and mental foramen in the young and at the mental foramen in the adults. 2. In positional relation in the mandibular canal in general between the nerve trunk and blood vessels the secondary nerve trunk, main artery and vein were observed to be positioned and running in the upper part and the chief trunk of nerve, arterioles, and venules in the lower part. 3. The number of nerve fibers of the inferior alveolar nerve among the three groups was the highest in the young adults. 4. Gradual decrease in the number of nerve fibers was observed at the time of passage of the inferior alveolar nerve fibers through the mandibular canal in the young and adults. However, the number once decreased at the first molar increased at the mental foramen in the young adults. 5. Non-myelinated fibers in the inferior alveolar nerve accounted for about 12 to 25%. 6. Nerve fibers of the inferior alveolar nerve became larger with growth. 7. Nerve fibers of the inferior alveolar nerve were mostly medium to small size of 5μ or smaller, nerve involving pain sensation accounted for the majority of the inferior alveolar nerve of Macaca irus.
- 九州歯科学会の論文
- 1981-01-25