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Plate 2

FIG. 3. Ovarian egg from a doe mated 4 hours previously. Tetrads fully formed and vesicular nucleus dissolved.

FIG. 4. Ovarian egg from a doe mated 5 hours previously. The tetrads have become smaller and arranged themselves in a plate. All traces of the vesicular membrane have disappeared.

FIG. 7. Ovarian egg from a doe mated 9 hours previously. First polar body and second polar spindle.

FIG. 8. Ovarian egg cultured for 24 hours in Ringer-Locke solution containing maturity hormone. Note apparent fusion nuclei.

FIG. 11. Ovarian egg from a doe mated 6 hours previously and inseminated in vitro with normal sperm. Male and female pronuclei present side by side.

FIG. 12. Ovarian egg from a doe mated 8 hours previously and inseminated with normal sperm. The first polar body has formed and sperm penetration occurred. The entering spermatozoan has formed a male pronucleus (centre left).

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Pages where the terms "Historic" (textbooks, papers, people, recommendations) appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms, interpretations and recommendations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)

Historic Embryology Papers


Pincus G. and Enzmann EV. The comparative behavior of mammalian eggs in vivo and in vitro. (1935) J Exp Med. 62(5): 665-75. PMID 19870440

Cite this page: Hill, M.A. (2024, February 21) Embryology Pincus1935-plate02.jpg. Retrieved from

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