, MD, Saint Louis University School of Medicine
Monthly, 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 into the fallopian tubes, where one semen fertilizes the egg. The fertilized egg (zygote) divides over and over repeatedly because it moves down the fallopian tube to the womb. First, the zygote becomes a good 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.
At 2 months of maternity, the placenta and fetus have already been developing for 6 months. The placenta types tiny projections that are hairlike) that increase in to the wall surface regarding the 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 into the villi through the mom’s blood that flows through the room surrounding the villi (intervillous area). This arrangement does the next:
Allows materials to be exchanged involving the bloodstream of this mom and that for the embryo
Stops the caretaker’s immunity system from attacking the embryo considering that the mother’s antibodies are way too big to feed the membrane layer (antibodies are proteins made by the defense mechanisms to assist protect your body against foreign substances)
The embryo floats in fluid (amniotic fluid), that is found in a sac (amniotic sac). Czytaj więcej about The phases of growth of the Fetus …