Amnion of the mammalian embryo is derived from –

Hint: Amnion is the innermost membrane that encloses the embryo of a mammal, bird, or reptile.

Complete answer:
Amnion of the mammalian embryo is derived from the ‘mesoderm' on the outer side and ‘ectoderm' on the inner side.

- The extraembryonic membranes consist of the Chorion (the combination of trophoblast plus underlying extraembryonic mesoderm), Amnion, Yolk sac, and Allantois.
- The amnion is a membrane that closely covers the embryo when first formed.
- It is filled with the amniotic fluid which causes the amnion to expand and become the amniotic sac which serves to provide a protective environment for the developing embryo or fetus.
- Chorion is formed from trophectoderm and mesoderm.
- Allantois and Yolk sac membranes have mesoderm on the outside and endoderm in the inner side.

Note:
- The Amniotic membrane is not part of the embryo itself but is derived from the tissues that emerged from the embryo.
- The amnion is found on the innermost part of the placenta. It lines the amniotic cavity and holds the amniotic fluid and the developing embryo.
- The chorion, on the other hand, is the outer membrane that surrounds the amnion, the embryo, and other membranes and entities in the womb.