The amnion of mammalian embryo is derived from
- ectoderm and mesoderm
- endoderm and mesoderm
- mesoderm and trophoblast
- ectoderm and endoderm
Answer
(1) ectoderm and mesoderm
Solution
The amnion is an extra-embryonic membrane formed from the somatopleure, i.e., the ectoderm lined on its outer side by the somatic layer of extra-embryonic mesoderm.
The yolk sac and allantois are formed from the splanchnopleure (endoderm + mesoderm), while the chorion is formed from the trophoblast and mesoderm.
The amnion is derived from ectoderm and mesoderm.
Answer: (1)