Nervous system develops from……. of embryonic layer.

Options

A. endoderm
B. chorion
C. ectoderm
D. mesoderm

Answer

To answer the question "Nervous system develops from……. of embryonic layer," we need to identify which embryonic layer is responsible for the development of the nervous system.

### Step-by-Step Solution:

1. **Identify the Embryonic Layers**:
- There are three primary germ layers in the embryo: ectoderm, mesoderm, and endoderm.

2. **Understand the Role of Each Layer**:
- **Endoderm**: This layer develops into the gut and various internal organs. It does not contribute to the nervous system.
- **Mesoderm**: This layer gives rise to muscle cells, connective tissues, and the circulatory system. It is also not responsible for the development of the nervous system.
- **Ectoderm**: This is the outermost layer that develops into the skin and nervous system.

3. **Determine the Correct Layer**:
- The nervous system originates from the ectoderm. This is the correct embryonic layer that gives rise to the nervous system.

4. **Conclusion**:
- Therefore, the answer to the question is that the nervous system develops from the **ectoderm** of the embryonic layer.

### Final Answer:
The nervous system develops from the **ectoderm** of the embryonic layer.