Embryology of the Female Genital Tract

  • Tim Parmley


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


Primordial Germ Cell External Genitalia Urogenital Sinus Embryonic Life Coelomic Cavity 
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© Springer Science+Business Media New York 1987

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  • Tim Parmley

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