Nerves develop from

Options

A. Ectoderm
B. Mesoderm
C. Endoderm
D. Both layers of mesoderm and endoderm.

Answer

**Step-by-Step Solution:**

1. **Identify the Question**: The question asks about the origin of nerves in the human body.

2. **Understand the Germ Layers**: In embryonic development, there are three primary germ layers: ectoderm, mesoderm, and endoderm. Each layer gives rise to different tissues and organs in the body.

3. **Ectoderm**: The ectoderm is the outermost layer and is responsible for developing the central nervous system (CNS) and the peripheral nervous system (PNS). This includes the brain, spinal cord, and nerves.

4. **Mesoderm**: The mesoderm is the middle layer and primarily gives rise to connective tissues, muscles, and the circulatory system.

5. **Endoderm**: The endoderm is the innermost layer and forms the lining of the gastrointestinal tract and other internal organs.

6. **Conclusion**: Since nerves are derived from the ectoderm, the correct answer to the question is option A: Ectoderm.

**Final Answer**: A. Ectoderm

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