胎児皮膚の分裂線と皮下脂肪層との関係について
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概要
- 論文の詳細を見る
Abe (1959) of this laboratory stated that the direction of the splitting lines approximately coincide with that of the hair stream in his study of the relation between the splitting lines and hair stream of embryonic skin, and pointed out that the splitting lines are conditioned by the running direction of the fiber fascicle at the superficial layer of corium, and at the same time the hair stream is conditioned by the direction of fiber fascicle at the border between the corium and the subcutaneous tissue, where the hair bulbus are placed. However, no work has been reported on the relationship between the splitting lines of skin and the growth direction of the fat tissue layer. The author presumed, in view of the fact that the fat tissue is one of the components of the skin, though positioned at the deepest layer, that the growth direction of the fat tissue layer would coincide with the splitting lines direction, if the line system of the splitting lines is the manifestation of the growth direction. For this purpose, observations were made on the relations of the splitting lines and growth direction of the fat tissue layer in the trunk where the growth of fat tissue layer is notably seen in the human embryo, examining 15 samples altogether, or 3 samples each of the breast, upper and middle abdomen, lower abdomen, back and gluteus. Usual observation and experiment were made to the splitting lines of the skin, but special attention was paid to do not hurt the subcutaneous tissue in peeling off the skin to expose the fat tissue layer. In the observation of the fat tissue layer, the configurations, size and positional arrangements of the fat granules were observed in detail through the magnifier. Following conclusions have been obtained by these observations : 1. The conditions of splitting lines of skin and those of the fat tissue layer are, although slighty different in the umbilicus region, generally in well aligned mutual relationship. In the fat tissue layers of the areas, corresponding to the independent line systems of the splitting lines, fat granules of ellipsoidal shape and of respectively different sizes are arranged, and as their length diameter leads to an uniform direction, indicates the obvious growth direction of the fat tissue layer. This direction conforms well to the direction of the line systems of the splitting lines. 2. Some areas surrounded with 2-3 independent line system groups are filled with irregular splitting line groups. The fat tissue layer corresponding to such area is collecting small fat granules of cuboidal shape and does not indicate any direction. 3. Above observations evidently prove prof. Nakayama's view that "the line system is the manifestation of the growth direction and the irregular splitting lines show the disturbance of the growth direction", or in other words "the splitting lines are the growth architecture."
- 九州歯科学会の論文
- 1977-03-31