Literaturdatenbank
Literaturdatenbank |
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Risley, P. L. (1934). The activity of the coelomic (germinal) epithelium of the male musk turtle, sternotherus odoratus (latreille). Journal of Morphology, 56(1), 59–99.
Added by: Admin (13 Sep 2009 10:11:23 UTC) |
| Resource type: Journal Article BibTeX citation key: Risley1934 View all bibliographic details  |
Categories: General Keywords: Kinosternidae, Schildkröten = turtles + tortoises, Sternotherus, Sternotherus odoratus, Zeitigung = incubation Creators: Risley Collection: Journal of Morphology |
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| Abstract |
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Sternotherus odoratus Histological studies of testes of both immature and mature individuals show that the peritoneal epithelium does not give up its proliferative capacities with the completion of testis differentiation. Certain regions of the antimesorchial surface retain their activity and continue to contribute cellular elements during testis growth. Stromal cells, germ cells, and sections of or entire seminiferous tubules originate from the peritoneum in the form of cord-like ingrowths. In this form, the proliferations of the germinal epithelium of the testes are similar to and homologous with the continuous proliferations of the germinal epithelium of the ovary. In Sternotherus, both testis and ovary differentiate out of a bisexual primordium in which the deeper parts of the germinal epithelium form an ovarian cortex. Since the germinal epithelium persists as an active part of both ovary and testis, it must be responsive to the same physiological factors of female or male differentiation respectively. It is indifferent sexually and once the direction of sex differentiation is established, the response of the germinal epithelium is in the determined direction. Its activity is then to produce either seminiferous tubules or ovarian follicles, and is directly dependent upon the processes of embryonic sex differentiation and determination.
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