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

Explanation

To determine the origin of the amnion in a mammalian embryo, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Embryonic Development**: After fertilization, the zygote undergoes multiple cell divisions, leading to the formation of an embryo. During this process, the embryo develops three primary germ layers: ectoderm, mesoderm, and endoderm.

2. **Identify the Germ Layers**:
- **Ectoderm**: The outer layer that gives rise to structures such as skin and nervous system.
- **Mesoderm**: The middle layer that forms muscles, bones, and the circulatory system.
- **Endoderm**: The innermost layer that develops into the gastrointestinal tract and associated organs.

3. **Recognize the Role of Embryonic Membranes**: In mammals, several embryonic membranes develop, including the amnion, chorion, allantois, and yolk sac. These membranes serve various functions, including protection and nourishment for the developing embryo.

4. **Focus on the Amnion**: The amnion is a specific membrane that surrounds the embryo and provides a protective amniotic cavity filled with amniotic fluid. This fluid cushions the embryo and allows for movement.

5. **Determine the Origin of the Amnion**: The amnion is derived from both the ectoderm and mesoderm layers. The ectoderm contributes to the outer layer of the amnion, while the mesoderm contributes to its inner structure.

6. **Conclude the Answer**: Therefore, the amnion of a mammalian embryo is formed from the ectoderm and mesoderm, making the correct answer option C.

### Final Answer:
The amnion of the mammalian embryo is derived from the ectoderm and mesoderm.

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