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The phases of Development of the Fetus

, MD, Saint Louis University Class of Medicine

Once per month, an egg is released from an ovary as a tube that is fallopian. After sexual activity, sperm move through the vagina through the cervix and womb to your fallopian pipes, where one semen fertilizes the egg. The fertilized egg (zygote) divides over over repeatedly because it moves down the fallopian tube to the womb. First, the zygote becomes a ball that is solid of. Then it becomes a ball that is hollow of known as a blastocyst.

The blastocyst implants in the wall of the uterus, where it develops into an embryo attached to a placenta and surrounded by fluid-filled membranes inside the uterus.

At 2 months of being pregnant, the placenta and fetus have already been developing for 6 days. The placenta kinds tiny projections that are hairlike) that increase to the wall surface associated with the womb. Arteries through the embryo, which go through the umbilical cable to the placenta, develop within the villi.

A slim membrane layer separates the embryo’s bloodstream into the villi through the mom’s blood that flows through the room surrounding the villi (intervillous room). This arrangement does the next:

Allows materials to be exchanged amongst the blood regarding the mom and therefore associated with embryo

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