雌メダカのシリビレ条前端部の小突起形成能

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Horny processes developed at the anterior margin of anal-fin rays of androgen-treated females of the orange-red variety of the medaka, Oryzias latipes, were studied histologically. Well-matured females more than 35mm in length and younger females with lengths of 29-32mm were used. The processes were induced by oral administration of ethisterone-diet (12μg/g diet) at 25±0.5℃. Although the formation of the processes is usually restricted to the posterior margin of joint plates, two females that formed the processes not only at the posterior margin but also at the anterior margin of certain rays were detected. In the forke drays of well-matured females, the processes were sometimes also formed at the posterior margin of the anterior branch and/or at the anterior margin of the posterior branch. These results seem to indicate that the anterior margin of joint plates has a process-forming ability, though the potential is very low as compared with the posterior margins. Electron microscopic observation revealed that the mesenchymal cells located at the anterior margin of joint plated showed very immature aspects similar to the mesenchymal cells of the posterior margins which seem to be the precursor cells of scleroblasts. After the initiation of ethisterone-treatment, these cells became enlarged and represented a fine structure resembling the scleroblasts developed at the posterior margins. These results may suggest that a small number of the precursor cells of scleroblasts are also distributed at the anterior margins.
社団法人日本動物学会の論文
1975-06-25

雌メダカのシリビレ条前端部の小突起形成能

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