Made up of mostly fibrous tissue and muscle, the cervix is circular in shape.įetus. This is the lower part of the uterus that projects into the vagina. The sac is filled with amniotic fluid (liquid made by the fetus) and the amnion (the membrane that covers the fetal side of the placenta), which protects the fetus from injury and helps to regulate the temperature of the fetus.Īnus. This is the opening at the end of the anal canal.Ĭervix. Anatomy of the fetus in uteroĪmniotic sac. This is a thin-walled sac that surrounds the fetus during pregnancy. In this procedure, a needle is inserted through the abdomen and uterus into the placenta to obtain the tissue sampleĪnother related procedure that may be used to diagnose genetic and chromosomal defects is amniocentesis. In this procedure, a catheter is inserted through the cervix into the placenta to obtain the tissue sample For this reason, women who undergo CVS also need a follow-up blood test between 16 to 18 weeks of their pregnancy to screen for neural tube defects. Unlike amniocentesis (another type of prenatal test), CVS does not provide information on neural tube defects, such as spina bifida. Testing may be available for other genetic defects and disorders depending on the family history and availability of lab testing at the time of the procedure.ĬVS is usually done between the 10th and 12th weeks of pregnancy. ![]() ![]() The chorionic villi are tiny projections of placental tissue that look like fingers and contain the same genetic material as the fetus. ![]() The placenta is a structure in the uterus that provides blood and nutrients from the mother to the fetus, Chorionic villus sampling (CVS), or chorionic villus biopsy, is a prenatal test that involves taking a sample of tissue from the placenta to test for chromosomal abnormalities and certain other genetic problems.
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