The ball and socket joint is found in

Options

A. skull
B. shoulder
C. knee
D. atlas and axis

Answer

To determine where the ball and socket joint is found, let's analyze the options provided:

1. **Skull**: The joints in the skull are primarily fibrous joints, which do not allow movement. Therefore, this option does not contain a ball and socket joint.

2. **Shoulder**: The shoulder joint is indeed a ball and socket joint. In this joint, the head of the humerus (the ball) fits into the glenoid cavity of the scapula (the socket). This allows for a wide range of motion in multiple directions.

3. **Knee**: The knee joint is classified as a hinge joint, which primarily allows for flexion and extension. It does not have the structure of a ball and socket joint.

4. **Atlas and Axis**: These are the first two cervical vertebrae in the spine. They form a pivot joint, allowing for rotation of the head. They do not form a ball and socket joint.

Based on this analysis, the correct answer is that the ball and socket joint is found in the **shoulder**.

### Step-by-Step Solution:
1. **Identify the Joint Types**: Understand the types of joints mentioned in the options.
2. **Analyze Each Option**:
- **Skull**: Identify it as a fibrous joint.
- **Shoulder**: Recognize it as a ball and socket joint.
- **Knee**: Identify it as a hinge joint.
- **Atlas and Axis**: Recognize it as a pivot joint.
3. **Conclude the Correct Answer**: Determine that the only option that describes a ball and socket joint is the shoulder.