Placenta circulation Cells known as trophoblasts, which arise from the implanting conceptus, invade the decidua and are therefore involved in early placental development. This is the beginning of the intercommunicating lacunar network that later becomes placental intervillous spaces. Some of the trophoblasts form the chorionic sac, whose surface is covered by tiny projections known as chorionic villi. As the chorion.. 2021. 7. 4. 이전 1 다음
