トノサマガエルRana nigromaculata精巣組織の周年変化 : 特に精巣卵の消長について

概要

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The seasonal changes in the testis of the frong, Rana nigromaculata, collected in Niigata district, were histologically observed. Ninety-six out of 153 frogs were found to have oocyte-like cells in the testis. Testis is filled with mature sperm in April and May. In late July spermatogenesis was very active and mean diameter of the oocyte-like cells was about 80μ. In mid September, when many newly formed spermatozoa were seen, testis-ova became about 130μ in diameter. In the next spring most testis-ova reached their size to 150μ in diameter, and the largest ones were measured over 200μ in diameter. However, further growth of testis-ova did not take place, and the cells degenerated after the breeding season. In the beginning of July many figures of the degeneration and resorption of testis-ova were observed. From these findings it is likely that oocyte-like cells are produced every year from spermatogonia and continue their growth for a year before their degeneration and resorption.
社団法人日本動物学会の論文
1971-08-15