Give and example of saddle joint.

Explanation

### Step-by-Step Text Solution:

1. **Understanding Saddle Joints**:
- A saddle joint is a type of synovial joint, which means it has a synovial cavity filled with synovial fluid. This fluid helps reduce friction and allows for smooth movement between the bones.

2. **Characteristics of Saddle Joints**:
- The opposing surfaces of a saddle joint resemble the shape of a saddle. This unique shape allows for a greater range of motion compared to other types of joints.

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