Amnion vs. Chorion

Amnionnoun

(anatomy) The innermost membrane of the fetal membranes of reptiles, birds, and mammals; the sac in which the embryo is suspended.

Amnionnoun

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

Amnionnoun

thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals)

Amnion

The amnion is a membrane that closely covers the human and various other embryos when first formed. It fills with amniotic fluid, which causes the amnion to expand and become the amniotic sac that provides a protective environment for the developing embryo.

Chorionnoun

The protective and nutritive membrane in higher vertebrates that attaches the fetus to the uterus.

Chorionnoun

The outer case of an insect egg.

Chorionnoun

(botany) The outer membrane of seeds of plants.

Chorionnoun

The outer membrane which invests the fetus in the womb; also, the similar membrane investing many ova at certain stages of development.

Chorionnoun

The outer membrane of seeds of plants.

Chorionnoun

outermost membranous sac enclosing the embryo in higher vertebrates (reptiles, birds and mammals)

Chorion

The chorion is the outermost fetal membrane around the embryo in mammals, birds and reptiles (amniotes). It develops from an outer fold on the surface of the yolk sac, which lies outside the zona pellucida (in mammals), known as the vitelline membrane in other animals.