Which membrane of the placenta forms a sac immediately around the fetus?

Question

Quizplus · Accepted Answer

The amnion is the innermost membrane of the placenta and forms a sac around the developing fetus. It is filled with amniotic fluid, which helps to protect and cushion the fetus during development. The chorion is the outermost membrane and is responsible for forming the placenta itself. The allantois is another membrane that contributes to the development of the placenta and helps with waste removal, while the urachus is a remnant of fetal development that connects the bladder to the umbilical cord.

Which Membrane of the Placenta Forms a Sac Immediately Around