Which structure of the mouth contains intrinsic and extrinsic muscles and what are their functions?

Explanation

**Step-by-Step Solution:**

1. **Identify the Structure**: The structure of the mouth that contains both intrinsic and extrinsic muscles is the **tongue**.

2. **Intrinsic Muscles**:
- **Location**: Intrinsic muscles are located **inside** the tongue.
- **Function**: The primary function of intrinsic muscles is to **change the shape of the tongue**. This allows for various movements such as curling, flattening, and elongating the tongue.

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