Zonary Placenta.
Normal zonary placentation. Endotheliochorial placentation. The dark line represent the marginal lakes. Frequently the degenerated blood is dark green and is referred to as uteroverdin.
McEntee K (1973)
Endothelial Chorion.
Endotheliochorial placentation. The dark line represent the marginal lakes.
Verstegen J (2009)