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 Vertebrae**: The atlas (C1) and axis (C2) are the first two cervical vertebrae in the human spine. Understanding their positions is crucial.

2. **Understand the Joint**: The joint formed between the atlas and axis is known as the atlantoaxial joint. This joint allows for a range of movements, particularly rotation of the head.

3. **Classify the Joint Type**: The atlantoaxial joint is classified as a synovial joint, which is a type of joint characterized by a fluid-filled joint cavity that allows for a significant range of motion.

4. **Determine the Specific Type of Synovial Joint**: Among the various types of synovial joints (such as hinge, ball-and-socket, pivot, etc.), the atlantoaxial joint is specifically a pivot joint. This type of joint allows for rotational movement around a single axis.

5. **Conclude the Answer**: Therefore, the type of movable joint present between the atlas and axis is a "pivot variety of synovial joint".

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

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