The embryonic-derived portion of the placenta is called
A - Chorion
B - Fetus
C - Blastocyst
D - Trophoblasts
Answer: A - Chorion
The chorion is the embryonic-derived portion of the placenta. It is composed of fetal blood vessels and trophoblasts which are organized into finger-like structures called chorionic villi. The chorionic villi are surrounded by the intervillous space, which is the part of the placenta surrounding the chorionic villi that contains maternal blood.