Heaviest vertebrae is :-

Options

A. Thoracic vertebrae
B. Lumbar vertebrae
C. Atlas vertebrae
D. Axis vertebrae

Answer

To determine the heaviest vertebrae, we need to analyze the options provided:

1. **Identify the vertebrae types**:
- Thoracic vertebrae
- Lumbar vertebrae
- Atlas vertebrae
- Axis vertebrae

2. **Understand the structure of each type**:
- **Thoracic vertebrae**: These are located in the upper and mid-back and are attached to the ribs.
- **Lumbar vertebrae**: These are located in the lower back and consist of five vertebrae (L1 to L5). They are larger and stronger than thoracic vertebrae, designed to bear more weight.
- **Atlas vertebrae**: This is the first cervical vertebra that supports the skull.
- **Axis vertebrae**: This is the second cervical vertebra that allows the head to rotate.

3. **Evaluate the weight and strength**:
- The lumbar vertebrae (L1 to L5) are the largest and strongest among the vertebrae. They are adapted to support the weight of the upper body and provide stability for the back muscles.

4. **Conclusion**:
- Based on the analysis, the heaviest vertebrae are the **lumbar vertebrae**.

Thus, the correct answer is **lumbar vertebrae**.