amniotic egg - a vertebrate egg with a shell which contains large nutrient and water stores and a number of specialized membranes. Found only in the reptiles, birds and monotremes. amylase - a complex of enzymes which break down starches into sugars
the avascular inner "shell" of the conceptus, embryologically continuous with the epithelium of the umbilical cord and the fetal skin. It forms the transparent membranous sac that is filled with amniotic fluid
Gr. amnion - the membrane around the fetus]. An extraembryonic membrane surrounding the embryo and containing the amniotic fluid which protects the embryo from shock and desiccation. It consists of ectoderm and somatic mesoderm.
The amnion is the inner of the two fetal membranes enclosing the developing embryo (the outer being the chorion or serosa). The amniotic cavity, which lies between the embryo and the amnion, is filled with amniotic fluid. This prevents adhesions between the embryo and parts of the egg.
The amnion is a membranous sac which surrounds and protects the embryo. It is developed in reptiles, birds, and mammals, which are hence called â€œAmniotaâ€; but not in amphibia and fish, which are consequently termed â€œAnamniaâ€.
The Amnion are a fictional alien species in Stephen Donaldson's The Gap Cycle. They are shown to be the only alien race humanity has made contact with, and play a major role in the series from Forbidden Knowledge onwards.