イノシシの下顎骨の形態的研究

概要

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Measurements were carried out on a total of 21 items of physical traits with regard to the length, height, width and thickness of the mandibular bone in wild boar and the data obtained were statistically analyzed to know the possible correlation existing between the growth of the jaw bone and increasing number of teeth on that jaw. The material consisted of a total of 213 pices of mandibular bone of wild boar captured at eastern district of Kyushu. These were divided into 4 groups having respectively 32, 36, 40 and 44 teeth on their dental arch, and each of these groups was further divided into 12 subgroups according to various combination of permanent and deciduous teeth found in individual jaw bone of animals. Statistical differences were summarized as follows. 1. With increasing number of teeth present in dental arch, the mandibular bone was larger in size with respect to its length, height, width and thickness. It was shown with every groups and subgroups that the growth of the bone was greater when the permanent teeth excelled deciduous teeth in number in the dental arch. 2. Growth in size of the mandibular that accompanied tooth increase was most conspicuous in its length, followed by height, width and thickness in order, 3. Arithmetic Mean and Mean of Population of the Length, Height, Width and Thickness of the Mandibular Bone of Wild Boar.
1975-09-30