Is the chorion laeve merely a remnant of the chorion frondosum in placental development? Or is it metabolically active, having something to do with maternofetal interactions? In order to answer ...

This trophoblast cell population forms the cell islands, septum, chorionic plate and chorion laeve. After 4–5 weeks of gestation (WG), both trophoblasts of EVT erupt in columns with the ...