Abstract
A NORMAL previllous human ovum, estimated from both its histological study and the precise menstrual and coital history of the patient to be nine to ten days old, was found in the uterus removed from a young married woman. In its detailed structure it appears to show minor differences from the ovum Wi-8004 recently discovered by Rock and Hertig1 and estimated by them to be 9·5 days old, although the comparison is based solely on a photomicrograph of one section of the latter ovum and the short preliminary report thereon so far published. These two ova represent the earliest specimens of fully implanted human ova yet discovered, and the present specimen shows several features of importance in the early organization of the human embryo.
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DAVIES, F. A Human Embryo, Nine to Ten Days Old. Nature 153, 463 (1944). https://doi.org/10.1038/153463a0
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DOI: https://doi.org/10.1038/153463a0
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