Name two types of matter of nervous system.

Explanation

**Step-by-Step Solution:**

1. **Identify the Types of Matter in the Nervous System:**
- The nervous system is primarily composed of two types of matter: gray matter and white matter.

2. **Describe Gray Matter:**
- Gray matter consists of numerous cell bodies of neurons. It is where the processing of information occurs. In the brain, gray matter is found on the surface layer (cortex) and in various nuclei.

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