👉 Placentalia is a term used in medical terminology to describe an organ that develops from the placenta, which is the tissue surrounding the fetus. The placenta is a complex structure consisting of the amniotic fluid (a jelly-like substance that surrounds and protects the developing fetus), the chorionic villi (the white, innermost layer of the placenta), and the zona pellucida (the outermost layer of the placenta).
placentalia