Answer: amnions

AnswerCrossword Clue
AMNIONSCertain membranes.
AMNIONSEmbryonic membranes
amnionssimilar membrane of insects and other invertebrates
amnionsthe innermost of the embryonic or fetal membranes of reptiles, birds, and mammals; the sac in which the embryo is suspended
amnionsAMNION, a membranous sac enclosing an embryo