トノサマガエル (Rana nigromaculata) 吸着器の形態および組織発生に関する研究

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The morphology and fine structures of the embryo suckers of Rana nigromaculata during development were observed. The results obtained are as follows. 1. At 2.0mm in body length, the suckers were recognized on the upper abdominal area as grooves composed of smaller cells without cilia (specific cells). The surroundings of the grooves thickend and was composed of the two types of surface cells with and without cilia. At the stage of 4.0 to 6.0 mm in body length, the suckers developed and completed their forms. Then, the suckers began to degenerate at 6.5mm in body length, and disappeared completely at 8.5 mm in body length. 2. Fully developed suckers were composed of the specific cells facing at grooves (described above), the basal cells and the surrounding cells. 1) The cells facing at grooves were long columnar (80∿90μm in length), and were filled up with secreting granules, yolk platelets, lipid droplets and pigment granules. 2) Basal cells were short in length and contained distorted nucleus, yolk platelets, lipids and mitochondria, and had a little of the other cellular organeles. 3) There were two cell types in surrounding cells (surface cell groups). One type of cells with cilia contained many mitochondria, and the other type without cilia containd many mucous and pigment granules. 4) All of these cells contained the rectangular crystalline structures in mitochondria.
1980-07-25