The chorionic sac is the structure formed by the chorion, the outermost membrane surrounding the embryo during fetal development in the uterus.
Here's a more detailed explanation:
- The chorion is a vital membrane that encloses and protects the developing embryo.
- According to the provided reference, after fertilization, the embryo develops inside the uterus, surrounded by two membranes:
- The outer chorion.
- The inner amnion.
The chorion and amnion together form the amniotic sac.
