Amnion

n.

1.

(Anat.) A thin membrane surrounding the embryos of mammals, birds, and reptiles.

Noun

1.

amnion - thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals) Synonyms: amnios, amniotic sac

allantoic membrane, amniotic sac, arachnoid membrane, basement membrane, conjuctiva, eardrum, hymen, maidenhead, membrana serosa, membrana tympana, membrane, meninges, meninx, neurilemma, pellicle, pericardium, perineurium, pleura, serosa, tympanic membrane, tympanum, velum