Question

The amnion of mammalian embryo is derived from

• A. ectoderm and endoderm
• B. ectoderm and mesoderm
• C. mesoderm and trophoblast
• D. endoderm and mesoderm

Answer 1

Answer: (B)

The extraembryonic or foetal membranes are amnion, chorion, allantois and Yolk sac.
Amnion is formed from mesoderm on outer side and ectoderm on inner side.
Chorion is formed from trophoectoderm and mesoderm whereas allantois and Yolk sac membrane have mesoderm on outerside and endoderm in inner side.