Some vertebrae of birds are fused to form
(a) Sacrum
(b) Synsacrum
(c) Coccyx
(d) None the above

Options

A. Scarum
B. Synsacrum
C. Coccyx
D. None the above

Answer

To solve the question regarding which structure is formed by the fusion of some vertebrae in birds, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks about the fusion of vertebrae in birds and what structure is formed as a result.

2. **Identify the Options**: The options given are:
- (a) Sacrum
- (b) Synsacrum
- (c) Coccyx
- (d) None of the above

3. **Research Bird Anatomy**: In birds, certain vertebrae are fused to provide structural support and stability for flight. This fusion is crucial for their skeletal system.

4. **Define the Terms**:
- **Sacrum**: In many vertebrates, including humans, the sacrum is a triangular bone formed from the fusion of several vertebrae.
- **Synsacrum**: In birds, the synsacrum is a specialized structure formed by the fusion of the sacral vertebrae with some of the lumbar and caudal vertebrae.
- **Coccyx**: This is the small bone at the end of the vertebral column in humans and some other animals, not specifically related to birds.

5. **Determine the Correct Answer**: Based on the definitions and the anatomical structure of birds, the correct answer is (b) Synsacrum. This is because the synsacrum is specifically the structure formed by the fusion of vertebrae in birds.

6. **Conclusion**: Therefore, the answer to the question is (b) Synsacrum.