Anatomy: Fetus in Utero
Amniotic sac. A thin-walled sac that surrounds the fetus during pregnancy. The sac is filled with liquid
made by the fetus (amniotic fluid) and the membrane that covers the fetal side of
the placenta (amnion). This protects the fetus from injury. it also helps to regulate
the temperature of the fetus.
Anus. The opening at the end of the anal canal.
Cervix. The lower part of the uterus that extends into the vagina. The cervix is made up
of mostly fibrous tissue and muscle. It is circular in shape.
Fetus. An unborn baby from the 8th week after fertilization until birth.
Placenta. An organ shaped like a flat cake. It only grows during pregnancy. The fetus takes
in oxygen, nutrients, and other substances from the placenta and gets rid of carbon
dioxide and other wastes.
Umbilical cord. A rope-like cord connecting the fetus to the placenta. The umbilical cord contains
2 arteries and a vein. It carries oxygen and nutrients to the fetus and waste products
away from the fetus.
Uterus. The uterus, or womb, is a hollow, pear-shaped organ ln a woman's lower stomach between
the bladder and the rectum. It sheds its lining each month during menstruation. A
fertilized egg (ovum) becomes implanted in the uterus, and the fetus develops.
Vagina. The part of the female genitals behind the bladder and in front of the rectum that
forms a canal. This extends from the uterus to the vulva.