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The phases of growth of the Fetus

Thursday, October 31st, 2019

, MD, Saint Louis University Class of Medicine

Once per month, an egg is released from an ovary in to a tube that is fallopian. After sexual intercourse, sperm move through the vagina through the cervix and womb towards the fallopian pipes, where one sperm fertilizes the egg. The fertilized egg (zygote) divides over over repeatedly because it moves down the tube that is fallopian the womb. First, the zygote becomes a great ball of cells. Then it becomes a ball that is hollow of called 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.

The placenta and fetus have been developing for 6 weeks at 8 weeks of pregnancy. The placenta types tiny hairlike projections (villi) that stretch in to the wall surface associated with womb. Bloodstream through the embryo, which go through the cord that is umbilical the placenta, develop within the villi.

A slim membrane layer separates the embryo’s bloodstream when you look at 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 between your bloodstream associated with the mom and that of this embryo

Prevents the caretaker’s disease fighting capability from attacking the embryo considering that the mom’s antibodies are way too big to feed the membrane layer (antibodies are proteins generated by the defense mechanisms to help protect your body against international substances)

The embryo floats in fluid (amniotic fluid), that will be found in a sac (amniotic sac).

The amniotic fluid does the annotated following: