The type of joint present between the humerus bone and the pectoral girdle is

Options

A. pivot joint
B. ellipsoid joint
C. gliding joint
D. ball and socket joint

Answer

To determine the type of joint present between the humerus bone and the pectoral girdle, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Bones Involved**:
- The humerus is the long bone of the upper arm, and the pectoral girdle consists of the clavicle and scapula, which connect the arm to the trunk.

2. **Understand Joint Types**:
- We need to evaluate the types of joints mentioned in the options:
- **Pivot Joint**: Allows rotation around a single axis (e.g., between the first and second cervical vertebrae).
- **Ellipsoid Joint**: Allows movement in two planes but not rotation (e.g., wrist joint).
- **Gliding Joint**: Allows sliding movements between flat surfaces (e.g., joints between carpal bones).
- **Ball and Socket Joint**: Allows movement in multiple directions, including rotation (e.g., shoulder and hip joints).

3. **Analyze the Functionality Required**:
- The shoulder joint (where the humerus meets the pectoral girdle) requires a wide range of motion, including rotation, which is characteristic of a ball and socket joint.

4. **Match the Joint Type to the Bones**:
- Since the humerus fits into the glenoid cavity of the scapula (part of the pectoral girdle) and allows for extensive movement, it is classified as a ball and socket joint.

5. **Conclusion**:
- Based on the analysis, the type of joint present between the humerus bone and the pectoral girdle is a **ball and socket joint**.

### Final Answer:
The type of joint present between the humerus bone and the pectoral girdle is **ball and socket joint** (Option 4).

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