The amnion of mammalian embryo is derived from

Options

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

Answer

**Step-by-Step Solution:**

1. **Understanding the Amnion**: The amnion is an extra embryonic membrane that surrounds the developing embryo in mammals, reptiles, and birds. It plays a crucial role in protecting the embryo by creating a fluid-filled cavity known as the amniotic sac.

2. **Identifying Germ Layers**: In mammalian embryos, there are three primary germ layers: ectoderm, mesoderm, and endoderm. Each layer gives rise to different structures and organs in the developing organism.

3. **Determining the Origin of the Amnion**: The amnion is specifically derived from two of these germ layers. It is important to differentiate which layers contribute to the formation of the amnion.

4. **Correct Answer Identification**: The amnion is derived from the ectoderm (the outer layer) and mesoderm (the middle layer). Therefore, the correct option that describes the origin of the amnion in a mammalian embryo is:
- Option 3: Ectoderm and Mesoderm.

5. **Conclusion**: The amnion serves as a protective layer for the embryo, and its derivation from the ectoderm and mesoderm is essential for its structure and function.

**Final Answer**: The amnion of the mammalian embryo is derived from the ectoderm and mesoderm (Option 3).

---