犬肩甲骨における分裂線 : 加齢的変化と内, 外対立面の相違を主題として
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概要
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The changing process of the splitting lines by age observed in the scapula of dogs has been pursued by the author, and further, the differences of the splitting lines seen in the opposite surfaces of the scapula, as a thin bone concurrently. The material used for these experiments were dogs, beginning with an embryo prenatal, 2, 4, 6 and 8 months, 1, 2, 5, 6, 7 and 8 years respectively post natal. Observations are summarized as follows : 1. With the embryo prenatal, the figure of splitting lines forms the radial splitting line systems whose directions are different on the opposite surfaces. The figure of splitting lines shows the growth of breadth with those 4 months post natal, and growth of length with those 6 months post natal. In short, since these fall on the most apparent growth stage, the intersecting figures of the splitting lines are most frequently observed on the opposite surfaces. 2. The dogs are perfected both morphologically and functionally as the adult dogs during the period from 8 months to 5 years post natal. Accordingly, systemized splitting lines indicating the direction of growth as well as the irregular splitting lines derived from the functions are observed frequently during this stage The areas with the intersecting figures of splitting lines on the opposite surfaces are less in number and more scattering than the previous period. 3. The stage including and after 6 years post natal is the atrophy period morphol ogically, and the splitting lines show the tendency to increase the intersecting figures on the opposite surfaces during this stage, repeating the cycle of irregularization and systemization derived from the atrophy. Such condition of the splitting lines is the sign of the evident atrophy. It is considered that these observations clearly prove that the views of Tappen (1964) are erroneously constructed.
- 九州歯科学会の論文
- 1977-05-31