犬の脳硬膜分裂線の加齢的変化について
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概要
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It is a familiar fact that the splitting-lines-method has been taken up as a simple means to learn the fibrous arrangements of tissues and organs. However, the significance of the splitting lines has not necessarily been concluded by the uniform notion yet. When Professor Nakayama enphasized in his research in 1956 the significance and constant existence of the irregular splitting lines that has been almost overlooked until then, he made it clear that the irregular splitting lines indicate the disorder of growing directions and a sort of defence reaction shown by the bone substance itself (bone tissue), or the direct functional manifestation of the bone tissue. He concluded that the splitting lines of the bones consist of the line systems which indicate the growing directions and the irregular splitting lines which show the disorder of their directions, and by observation of both line systems and irregular splitting lines the age changes of the splitting lines on the bones are known to be the sign of their growing process. Although studies on the dura mater encephali have been reported by Kajimura (1925), Fukui (1936), Gr. T. Popa (1937), and Saito (1957), nothing has been mentioned by them on significance of the irregular splitting lines. Therfore, in order to see whether Nakayama's points of view may be proved with the dura mater encephali or not, as have been proved by the progenitors with the various membranes in our laboratory, the author has pursued and kept observation on the age changes of the splitting lines in the dura mater encephali of the dogs from 10 days to 14 years post-natal. Following summary contains the conclusions of the study. 1. In the dura mater encephali, too, the splitting lines consists of the line systems and the irregular splitting lines. 2. The age changes of the splitting lines demonstrates growing process of development of the dura mater encephali. 1) Incipient growth stage (10-20 days post-natal) 2) Rapid growth stage (1-6 months post-natal) 3) Pre-maturation stage (8-10 months post-natal) 4) Maturation stage (1-5 years post-natal) 5) Atrophy stage (7-14 years post-natal) 3. It is considered to be characteristic with the dura mater encephali, as compared with other membranes, that there is distinguishable growth speed difference between the various portions of the dura mater encephali, which is estimated by the age changes of the splitting lines.
- 1976-11-30