犬の精巣鞘膜臓側板上に於ける分裂線の年令的変化に就て
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概要
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Age changes of the splitting lines occurring in the visceral wall of the tunica vaginalis propria testis have been observed in dogs, and the following four stages of developmental phases were noticed. The first stage : This corresponds to the period from the first month of birth to the third month where the splitting lines occurring in the ventral surface run generally longitudinally and those occurring in the medial and lateral surfaces tend to converge toward the caudal end, and these constitute arched line systems dispersing antero-interior and antero-exterior side respectively. There were noticed several masses of irregular splitting lines at the posterior half of each line system. The second stage : This comprises the period from the third month to the eleventh month of the animal where the arched line system hitherto shown assume more increased curvature and sometimes take even S-form. In the general view, however, there is the impression that the arched line systems have turned into irregular ones, and in fact there also appear marked masses of the irregular splitting lines. The third stage : This corresponds to the period from one year to four years of age of the animal where the splitting lines assume most complicated picture along with full development of the testis. There is seen strong winding of the splitting lines in S-form and increased number of the arched line systems together with the increase of the sites in which the irregular spritting lines are seen. The fourth stage : This includes the poriod from six to eight years of age in which the testis has undergone considerable diminution in size. The curvature of the splitting lines tends to be more flat and gives more simplified appearance. However, there in the posterior half of the ventral surface one notices a region showing marked masses of irregular splitting lines. These finding seem to indicate that fhe period from five months to four years of age of the animal represents the time in which the testis displays most vital function of its own as evidenced by the occurrence of the masses of irregular splitting lines. However, by six, seven and eight years of age of the animal, all the arched line systems become simplified and flat in their curvature, and the mass of the irregular splitting lines becomes to be restricted to a single region of the wall to show atrophic condition of the organ. These changes in the splitting lines shown in the visceral wall of the tunica vag. propria testis in dogs should be interpreted as representing the structural development of the tunica of the testis. To put it more particularly, the splitting lines occurring in the serous membrane of the tunica not only undergo influence of the development of its substantia exerted from within, but also are influenced by various mechanical and dynamic factors from outside, and these are left imprinted on the splitting lines as they themselves go developing through each stage of animal′ life
- 九州歯科学会の論文