Name the following.
The cavities in the brain

Explanation

**Step-by-Step Solution:**

1. **Identify the Cavities**: The question asks for the cavities present in the brain.

2. **Name the Cavities**: The cavities in the brain are known as the **ventricles**.

3. **Understand the Structure**: The ventricular system of the brain consists of:
- Two **lateral ventricles**
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