chorion laeve

This part of the chorion becomes smooth, and is named the chorion laeve (from the Latin word levis, meaning smooth).

As the chorion grows, the chorion laeve comes in contact with the decidua parietalis and these layers fuse.

Villi on the opposite side (abembryonic pole) degenerate and form the chorion laeve (or chorionic laevae), a smooth surface.

Unexpectedly, no ERα immunoreactivity was found in extravillous trophoblast cells and adjacent decidual cells, either in chorion laeve (Fig.