犬の腎被膜(線維被膜深層)分裂線の加齢的変化について
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概要
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Researches on the fibrous architecture of capsule of animal organs based on the splitting line method have been practiced for many years, and a series of reports have been submitted on this subject. However, it is noted that the existence and significance of the irregular splitting lines have not been mentioned in these reports, al hough the line systems are the main concern of their observations. It was by Dr. Nakayama (1956) that the meaning of existence of the irregular splitting lines was taken up and disclosed for the first time. After accumulated studies, he offered the following statements : "The line systems indicate the direction of growth, while the irregular splitting lines are the signs of disorder of the growing direction due to collision of various internal growth strengths, or the physiological load or other external influences. In other words, the irregular splitting lines are the direct functional manifestation that may be interpreted as a sort of defense reaction of the tissue itself. Accordingly, the growing stages of the tissue and organs can be learned by combined observations of the line systems and the irregular splitting lines." In the report of Klaus Niessing (1935) the splitting lines appearing on the kindey capsule of sheep, observations on the line systems were presented but nothing was mentioned on the irregular splitting lines. In this study the author has observed the aging changes of the splitting lines of the fibrous capsule (deep layer) of dog's kidney, respectively at such growing stages as 10 days post-natal, one month, 2 months, 4 months, 6 months, 8 months, 10 months, 1 year, 2 years, 4 years, 6 years, 8 years, 10 years and 12 years, to compare the findings with K. Niessing's opinion. Following conclusions have been obtained by the review that was made based upon Dr. Nakayama's points of view : 1. The splitting lines in the fibrous capsule (deep layer) in the kidney are not merely of the line systems alone as indicated by Niessing, but obviously distinguishable to be the mixture of line systems and irregular splitting lines, or more precisely, the irregular splitting lines are dominant. 2. The tendency of loop formation especially in both abdominal and dorsal surfaces realistically portrays the growing stages of the fibrous capsule itself of the kidney that corresponds to the pulsative volume fluctuation inherent to the appearance of kidney functioning. 3. The indication of K. Niessing that the pulsative volume fluctuation is stronger in the abdominal surface than in the dorsal surface can be analogized from the difference of the splitting line conditions between both surfaces. 4. The irregular splitting lines appear distinctively throughout the whole aging stages and include what may be called even the "irregular splitting line systems". Similar fact by Nakamichi can be observed in the splitting lines on the mucous membrane of the tougue, a muscular organ that demonstrated polymorphic active motions. This is another proof which emphasizes the existence and the meaning of the irregular splitting lines. 5. The kidney growth of the dog is classified into four stages as below by the aging change of the splitting lines in its fibrous capsule : a. Incipient growth stage (10-30 days post-natal) b. Rapid growth stage (2-8 months post-natal) c. Maturation stage (10 months-6 years post-natal) d. Atrophy stage (8-12 years post-natal)
- 1976-09-30