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Abstract

The fertilized ovum reaches the uterine cavity in about 4 days as a morula of 12 to 16 cells. After developing a blastocoele and losing the zona pellucida, it implants on approximately the sixth day after conception. By the eighth day, the blastocyst consists of a chorionic membrane containing within it a bilaminar embryonic disk, separating the amniotic and yolk sac cavities. By the 11th or 12th day, the trophoblastic portion of the chorionic membrane shows clear-cut differentiation into cytotrophoblast, intermediate trophoblast, and syncytiotrophoblast.7

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© 1987 Springer Science+Business Media New York

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Parmley, T. (1987). Embryology of the Female Genital Tract. In: Kurman, R.J. (eds) Blaustein’s Pathology of the Female Genital Tract. Springer, New York, NY. https://doi.org/10.1007/978-1-4757-1942-0_1

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  • DOI: https://doi.org/10.1007/978-1-4757-1942-0_1

  • Publisher Name: Springer, New York, NY

  • Print ISBN: 978-1-4757-1944-4

  • Online ISBN: 978-1-4757-1942-0

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