, MD, Saint Louis University School of Medicine
Once per month, an egg is released from an ovary as a fallopian pipe. After sexual activity, sperm move through the vagina through the cervix and womb to your fallopian tubes, where one semen fertilizes the egg. The fertilized egg (zygote) divides over and over over and over over and over repeatedly because it moves along the fallopian tube to the womb. First, the zygote turns into 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 now been developing for 6 days. The placenta types tiny hairlike projections (villi) that increase in to the wall surface of this womb. Bloodstream through the embryo, which move across the cord that is umbilical the placenta, develop into 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). Continuer la lecture de The phases of Development of the Fetus