The outer membrane (chorion) and trophoblast layer of the placenta are derived from the trophoectoderm of the blastocyst cells. Other extra-embryonic tissues, including the amnion (inner membrane ...

Strictly defined, chorioamnionitis is a histopathologic finding of inflammation of the amnion and/or the chorion ... the fetal membranes, the placenta, and/or the uterus. In clinical practice ...