The articulation of odontoid process of axis and atlas is an example of

Options

A. pivot joint
B. synovial joint
C. ball and socket joint
D. none of these

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the articulation of the odontoid process of the axis (C2 vertebra) and the atlas (C1 vertebra). We need to identify the type of joint formed by this articulation.

2. **Identifying the Bones**: The atlas (C1) is the first cervical vertebra that supports the skull, while the axis (C2) is the second cervical vertebra that allows for rotation of the head.

3. **Defining the Odontoid Process**: The odontoid process, also known as the dens, is a bony projection from the axis that fits into the atlas. This structure is crucial for the rotation of the head.

4. **Types of Joints**: We need to consider the options provided:
- **Pivot Joint**: A type of synovial joint where one bone rotates around another.
- **Synovial Joint**: A general category of joints that includes pivot joints.
- **Ball and Socket Joint**: A joint that allows for multi-directional movement and rotation (e.g., shoulder joint).
- **None of These**: This option suggests that none of the provided types apply.

5. **Analyzing the Joint Type**: The articulation between the odontoid process of the axis and the atlas allows for rotational movement, which is characteristic of a pivot joint. In a pivot joint, one bone (the odontoid process) is cylindrical and rotates within a ring formed by another bone (the atlas).

6. **Conclusion**: Based on the analysis, the articulation of the odontoid process of the axis and atlas is best classified as a **pivot joint**.

7. **Final Answer**: The correct answer is the first option: **Pivot Joint**.

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