, MD, Saint Louis University Class of Medicine
Once per month, an egg is released from an ovary into a tube that is fallopian. After intercourse, sperm move through the vagina through the cervix and womb into the fallopian pipes, where one semen fertilizes the egg. The fertilized egg (zygote) divides over over repeatedly since it moves along the fallopian tube to the womb. First, the zygote turns into a ball that is solid of. Then it turns into a hollow ball of cells called a blastocyst.
Within the womb, the blastocyst implants within the wall surface of this womb, where it develops into an embryo mounted on a placenta and enclosed by fluid-filled membranes.
The placenta and fetus have been developing for 6 weeks at 8 weeks of pregnancy. The placenta types tiny hairlike projections (villi) that increase to the wall surface of this womb. Arteries through the embryo, which move across the umbilical cable to the placenta, develop into the villi.
A slim membrane layer separates the embryo’s bloodstream within the villi through the mom’s blood that flows through the room surrounding the villi (intervillous room). Continue a ler sobreThe phases of Development of the Fetus …