著者
波江 元吉
出版者
社団法人日本動物学会
雑誌
動物学雑誌 (ISSN:00445118)
巻号頁・発行日
vol.1, no.14, pp.510-511, 1889-12-15
被引用文献数
1
著者
波江 元吉 土田 兎四造
出版者
社団法人日本動物学会
雑誌
動物学雑誌 (ISSN:00445118)
巻号頁・発行日
vol.4, no.50, pp.479-483, 1892-12-15
著者
波江 元吉
出版者
社団法人日本動物学会
雑誌
動物学雑誌 (ISSN:00445118)
巻号頁・発行日
vol.27, no.325, pp.600-601, 1915-11-17
著者
吉倉 眞
出版者
社団法人日本動物学会
雑誌
動物学雑誌 (ISSN:00445118)
巻号頁・発行日
vol.60, no.11, pp.236-239, 1951-11-15

More than 1, 500 frogs of Rana limnocharis were collected in Kumamoto district and used for a morphological study on the differentiation of their gonads. Results obtained were as follows: 1) Shortly after metamorphosis the gonads of all young frogs are of ovarian type in external appearance at least. But as they grow older, the gonads in about a half of them become testes, which are distinguishable macroscopically from the ovaries. This sex ratio is established at the end of the first year. 2) Examining the gonads microscopically at the end of metamorphosis, the gonads of the genetic males have a testicular structure, and in about a half of them the oocyte-like cells are present. 3) Although most of the oocyte-like cells degenerate during the first year, some of them remain and continue their growth in the following year. But they seldom attain about 150μ in diameter.
著者
吉倉 眞
出版者
社団法人日本動物学会
雑誌
動物学雑誌 (ISSN:00445118)
巻号頁・発行日
vol.56, no.1, pp.6-7, 1944-03-15
被引用文献数
1
著者
吉倉 真
出版者
社団法人日本動物学会
雑誌
動物学雑誌 (ISSN:00445118)
巻号頁・発行日
vol.79, no.11, 1970-12-15
著者
吉倉 真
出版者
社団法人日本動物学会
雑誌
動物学雑誌 (ISSN:00445118)
巻号頁・発行日
vol.72, no.1, pp.13-16, 1963-01-15

The present study was undertaken with the object of determining whetehr the hypopysis has some connection with sex reversal in amphibians. Hypophysectomized or thyroidectomized frog larvae (Rana japonica) were treated with estrone (1mg/1) from 105 days of age for 45 days and thereafter maintained without estrone up to 225 days of age. In both groups of animals ovaries were not affected by estrone, but the testes, in most cases, were feminized (Figs. 1, 2). The hypophysis therefore had no connection with gonad feminization. After the treatment was stopped, feminized gonads of thyroidectomized larvae were restored to the testes, all of the ovocytes were destroyed, and the luteal-like bodies were formed (Fig. 3). On the other hand, feminized gonads of hypophysectomized larvae seemed to have evolved into the ovaries (Fig. 4). It seems probable that when the hormonal treatment is stopped, the hypophysis controls the developmental fate of the gonad feminized by the action of estrone.
著者
吉倉 真
出版者
社団法人日本動物学会
雑誌
動物学雑誌 (ISSN:00445118)
巻号頁・発行日
vol.76, no.11, pp.394-395, 1967-12-15