Answer: amnion

AnswerCrossword Clue
AMNIONEmbryonic membrane
AMNIONMembranous sac
AMNIONEmbryonic sac
AMNIONProtective membrane
amnionthe innermost of the embryonic or fetal membranes of reptiles, birds, and mammals; the sac in which the embryo is suspended
amnionmembrane analogous to the amnion and occurring in various invertebrates
amnionsimilar membrane of insects and other invertebrates
amniona thin membrane forming a closed sac about the embryos or fetuses of reptiles, birds, and mammals and containing the amniotic fluid
amniona membranous sac enclosing an embryo