The amniotic sac, or amnion, is a lining (membrane) inside the uterus that contains the fetus and the fluid that cushions the fetus (amniotic fluid). The amniotic sac is also called the "bag of waters."
| By | Healthwise Staff |
| Primary Medical Reviewer | Sarah Marshall, MD - Family Medicine |
| Specialist Medical Reviewer | William Gilbert, MD - Maternal and Fetal Medicine |
| Last Revised | January 10, 2011 |
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