The Eggs of Mammals (1936) Figures

From Embryology

Figures

The Eggs of Mammals (1936): Introduction | The Origin of the Definitive Ova | The Growth of the Ovum | The Development and Atresia of Full-Grown Ova and the Problem of Ovarian Parthenogenesis | Methods Employed in the Experimental Manipulation of Mammalian Ova | The Tubal History of Unfertilized Eggs | Fertilization and Cleavage | The Activation of Unfertilized Eggs | The Growth and Implantation of the Blastodermic Vesicle | Summary and Recapitulation | Bibliography | Figures | Historic Disclaimer
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Plate I

(From the Journal of Morphology)


Figs. 1-5. Nuclei of ova from ovary of rat 5 days post partum. 1, Deutobroch nucleus in germinal epithelium. 2, Leptotene nucleus. 3, Synizesis. 4, Pachynema. 5, Diplonema.

Figs. 6-9. Nuclei of ova from ovary of rat 8 days post partum. 6, Deutobroch nucleus. 7, Synizesis. 8, Stage following 7, evidently modified pachynema. 9, Diplonema.

Figs. 10-13. Nuclei of ova from ovary of rat 10 days post partum. 10, Deutobroch nucleus. 11, Synizesis. 12, Modified pachynema. 13, Diplonema.

Figs. 14-16. Nuclei of ova from ovary of rat 15 days post partum. 14, Deutobroch nucleus. 15, Modified pachynema. 16, Masses of chromatin changing into loose threads.


Plate II

(From the Journal of Morphology)

Figs. 17-22. Nuclei of ova from ovary of rat 20 days post partum. 17, Deutobroch nucleus. 18, Beginning of the formation of clumps shown in next figure. 19, Modified pachynema. 20, Later stage showing characters of diplonema. 21, Nucleus toward the end of the growth period. 22, Final stage in twenty-day rat.