著者

手代木 渉 志田 孝夫

出版者

日本動物学会

雑誌

動物学雑誌 (ISSN:00445118)

巻号頁・発行日

vol.77, no.11, pp.350-358, 1968-11

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It is well known that in the amphibian tail the main axis of regeneration blastema is at the right angle with the cut-surface (Barfurth, 1923). The same view has been held by many investigators who worked with various animals. For supporting this view, the cellular materials concerned in regeneration must be produced uniformly from the cut-surface, as stated by E. Korschelt (1927) and Yo. K. Okada (1950). However, this did not hold in planarians, since the rate of production of new tissue at the cut-surfaces differs along the longitudinal or the lateral axes of the body. The rate of regeneration in the amphibian tail was exactly the same to that of planarians. When the planarian or amphibian tail was sectioned obliquely, the axis of blastema was not always at the right angle with the cut-surface. It has been conclusively shown in the planarian and amphibian tail that as the acute angle between cut-surface and the main axis of the body (section angle) approaches the right angle, the acute angle of blastema-axis to the main axis of the body (regeneration angle) falls to zero, while, the regeneration angle becomes at the right angle as the section angle approaches zero. This can be mainly explained by differences in the rate of regeneration of new tissue along the cut-surface of the oblique section.