The Placenta

4. Marked thickening and edematous swelling of the placenta often associated with immune or non-immune fetal status: placental ______.
7. Microscopic vascular projections of the chorion frondosum where maternal-fetal metabolic and gas exchange occurs.
9. The most common primary benign vascular tumor of the placenta.
10. Severe form of invasive placenta where chorionic villi penetrate completely through the myometrium and uterine serosa: placenta ______.
12. Premature separation of a normally implanted placenta from the myometrium prior to delivery: placental ______.
13. Condition where unprotected umbilical fetal blood vessels cross the internal os ahead of the presenting fetus: ______ previa.
14. Uterine decidual layer at the blastocyst implantation site that forms the maternal contribution to the placenta: decidua ______.

1. Uterine decidual layer lining the remainder of the endometrial cavity away from the implantation site: decidua ______.
2. Uterine decidual layer that covers and overlies the expanding blastocyst: decidua ______.
3. Outer syncytial layer of the trophoblast that invades the uterine wall and forms the early placenta.
5. Placental anomaly where the fetal membranes fold back upon themselves, creating a raised central placental ring.
6. Accessory placental lobe connected to the main placental mass by intramembranous vessels.
8. Abnormally invasive placenta where chorionic villi extend deeply into the myometrium without breaching the serosa: placenta ______.
11. Rare ring-shaped placental morphology that extends circumferentially around the inner uterine wall.