What is the type of movable joint present between the atlas and axis?

Options

A. Pivot
B. Saddle
C. Hinge
D. Gliding

Explanation

To answer the question about the type of movable joint present between the atlas and axis, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Bones Involved**:
- The atlas and axis are the first two cervical vertebrae in the spine. The atlas (C1) supports the skull and allows for nodding movements, while the axis (C2) allows for rotation of the head.

2. **Determine the Type of Joint**:
- The joint between the atlas and axis is specifically designed for rotational movement. This type of joint is known as a **pivot joint**.

3. **Characteristics of the Pivot Joint**:
- A pivot joint allows for rotational movement around a single axis. In this case, it enables the head to turn from side to side, which is essential for activities such as shaking the head "no".

4. **Synovial Joint Classification**:
- The pivot joint is classified as a type of **synovial joint**, which is characterized by a fluid-filled joint cavity that allows for smooth movement between the articulating bones.

5. **Conclusion**:
- Therefore, the type of movable joint present between the atlas and axis is a **pivot joint**.

### Final Answer:
The type of movable joint present between the atlas and axis is a **pivot joint**.

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