Abstract
Introduction THE theory of early germ cell segregation in animals was advanced by Nussbaum, in 1880. Swift (7) contended that the primordial germ cells in the chick embryo arise extra-embryonally during the primitive streak stage from an area known as the germinal crescent. The large entodermal cells enter the adjacent mesoderm and pass to the gonadal region. As such, they enter the germinal epithelium and become the definitive germ cells of the chick embryo. Benoit (1) attempted to destroy the germinal crescent by ultra-violet irradiation. Chick embryos from 18 to 24 hours old were irradiated for from 10 to 15 minutes and then allowed to incubate for about two days. Histologic examination revealed that there were no germ cells in the gonadal region. Essenberg and Garwacki (4) reported the finding of transitional stages in germ cells, indicating that germ cells originate from the peritoneal epithelium in the chick embryo. These conflicting data induced the present writer to undertake the study of the effe...
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