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

Options

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

Answer

To answer the question, "What is 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 (C1) and axis (C2) are the first two cervical vertebrae in the vertebral column. The atlas supports the skull and allows for nodding movements, while the axis allows for rotational movement of the head.

2. **Understand the Joint Type**: The joint between the atlas and axis is crucial for the movement of the head. It allows for a specific type of motion that is different from other joints in the body.

3. **Analyze the Options**: The options provided are:
- A) Pivot
- B) Saddle
- C) Hinge
- D) Gliding

4. **Determine the Correct Joint Type**:
- **Pivot Joint**: This type of joint allows for rotational movement. In the case of the atlas and axis, the atlas rotates around the dens (odontoid process) of the axis, allowing for the "no" motion of the head.
- **Saddle Joint**: This type allows for movement in two planes but is not present between the atlas and axis.
- **Hinge Joint**: This type allows for movement in one plane (like the elbow or knee) and is not applicable here.
- **Gliding Joint**: This type allows for sliding movements and is not the correct type for the atlas and axis.

5. **Conclusion**: Based on the analysis, the joint between the atlas and axis is a **pivot joint**. Thus, the correct answer is option A.

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

---