Typical thoracic vertabrae are

Options

A. 12
B. 1,9,10,11,12.
C. 1,2,7
D. 1 to 8

Answer

### Step-by-Step Solution:

1. **Understanding Thoracic Vertebrae**:
- The thoracic vertebrae are part of the vertebral column located between the cervical (neck) vertebrae and the lumbar (lower back) vertebrae.

2. **Counting Thoracic Vertebrae in Humans**:
- In humans, there are a total of 12 thoracic vertebrae, numbered T1 to T12.

3. **Identifying Typical vs. Atypical Thoracic Vertebrae**:
- Thoracic vertebrae can be classified into typical and atypical types.
- Typical thoracic vertebrae are those that have similar structures and characteristics, while atypical vertebrae have unique features.

4. **Number of Typical Thoracic Vertebrae**:
- There are 7 typical thoracic vertebrae, which are T2 to T8.
- The atypical thoracic vertebrae include T1, T9, T10, T11, and T12.

5. **Conclusion**:
- Therefore, the answer to the question "Typical thoracic vertebrae are" is 7, specifically T2 to T8.

### Final Answer:
- **Typical thoracic vertebrae are 7 (T2 to T8).**

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