Definition
The amniotic sac is a fluid-filled sac that surrounds and protects a developing fetus in the uterus during pregnancy. Think of it as the fetus's cozy waterbed 🚼. It's formed by the amnion and chorion membranes. The amniotic fluid within cushions the fetus, allowing it to move and grow. The sac also helps regulate temperature and protects against infection. Rupture of the amniotic sac is commonly known as 'water breaking,' signaling the start of labor. It's essential for healthy fetal development.