placentáció
Placentation is the formation and development of the placenta, the transient organ that links the developing fetus to the maternal circulation. Through the placenta, nutrients and oxygen are supplied to the fetus and waste products removed, while hormones produced by the placenta support pregnancy.
During placentation, trophoblast cells from the outer blastocyst invade the maternal endometrium (decidua), form chorionic villi,
Placental organization varies across mammals. Types of placentation include epitheliochorial (all maternal barriers intact; observed in
Functions extend beyond nutrient and gas exchange. The placenta synthesizes hormones such as human chorionic gonadotropin,
Disorders of placentation can contribute to complications such as intrauterine growth restriction, preeclampsia, and preterm birth.