Origin of Somatic Cells in Bidder's Organ and the Gonad Proper in the Toad, Bufo japonicus formosus(COMMUNICATION)(Developmental Biology)
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概要
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The development of Bidder's organ was observed ultrastructurally and made a comparison with the gonad proper in Bufo japonicus formosus. The primordia of Bidder's organ and the gonad proper consisted of coelomic epithelial cells and primordial germ cells. The gonad proper showed a typical corticomedullary structure. After the gonadal sex differentiation, the medulla in the primordial testis developed together with migration of germ cells from the cortex, and the medulla in the primordial ovary developed as a somatic cell mass. Bidder's organ showed no corticomedullary structure and no sexual difference. Numerous gonial cells enlarged without meiotic nuclear change, and were surrounded by a layer of epithelial cells. The origin of somatic cells in Bidder's organ was identical with that in the gonad proper, so that the peculiar development of Bidder's organ is not attributed to the cellular origin. We discuss the possible cause of the development of Bidder's organ.
- 1992-04-15
著者
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Iwasawa Hisaaki
Department Of Dental Pharmacology School Of Dentistry Higashi-nippon-gakuen University
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TANIMURA Akihiko
Department of Dental Pharmacology, School of Dentistry, Health Sciences University of Hokkaido
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Tanimura A
Department Of Pharmacology School Of Dentistry Health Sciences University Of Hokkaido
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Tanimura Akihiko
Department Of Dental Pharmacology School Of Dentistry Health Sciences University Of Hokkaido
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Iwasawa Hisaaki
Department Of Biology Faculty Of Science Niigata University
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