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Anatomic Structure of the Early Pregnancy
The recently implanted embryonic cell mass forms an interface with the endometrial decidual, the the trophoblastic cell layer identified as the chorionic layer. The cell mass actually implants into the substance of the decidua, and the overlying decidual covers the implanted mass. Because of this the early development of the gestation appears to occur within the decidual layer, and enlarges to fill the endometrial cavity later.Following implantation, a cavity or sac develops which lies inside the chorionic layer. This subchorionic layer contain the yolk sack (secondary) and the embryonic disk (early embryonic cell mass) surrounded by it's own small amniotic cavity.At about 5 weeks the gestational sac shows a well defined yolk sac within the chorionic cavity (extraembryonic coelom). The embryo and amniotic cavity very small. The gestational sac grows at a rate of about 1mm per day. As a rule of thumb, the menstrual age in days can be estimated by adding 30 days (first appearence of sac) to the sac size in mm (1mm = 1 day)
As gestation progresses, the embryo and amniotic cavity grow rapidly and crowd out the chorionic cavity, and subsequently bulge into and then fill the endometrial (subchorionic) cavity.
As gestation progresses, the embryo and amniotic cavity grow rapidly and crowd out the chorionic cavity, and subsequently bulge into and then fill the endometrial (subchorionic) cavity. As gestation progresses, the embryo and amniotic cavity grow.
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