- Placenta: vascular, disc-shaped fetomaternal organ attaching the fetus to the uterine wall via the umbilical cord.
- Fetal component develops from chorion frondosum; maternal component develops from decidua basalis.
Development of Placenta
- Chorionic villi over decidua capsularis degenerate to form smooth chorion laeve; villi over decidua basalis persist and grow extensively as chorion frondosum.
formation of chorion frondosum and chorion laeve Formation of chorion frondosum and chorion laeve.