Vertebral formula of human is –

Options

A. `C_(7)T_(12)L_(7)S_(4)Co_(5)`
B. `C_(7)T_(12)L_(5)S_((5))Co_((4))`
C. `C_(7)T_(12)L_(5)S_((4))Co_((5))`
D. `C_(7)T_(12)L_(7)S_((5))Co_((4))`

Answer

To determine the vertebral formula of a human, we need to count the number of vertebrae in different regions of the vertebral column. The vertebral column consists of several sections, each with a specific number of vertebrae. Here’s a step-by-step breakdown:

### Step-by-Step Solution:

1. **Cervical Vertebrae**:
- Humans have **7 cervical vertebrae**. These are the vertebrae located in the neck region.
- **Count**: 7

2. **Thoracic Vertebrae**:
- There are **12 thoracic vertebrae**. These vertebrae are located in the upper and mid-back and are attached to the ribs.
- **Count**: 12

3. **Lumbar Vertebrae**:
- The lumbar region consists of **5 lumbar vertebrae**. These are located in the lower back.
- **Count**: 5

4. **Sacral Vertebrae**:
- The sacrum is formed by **5 fused vertebrae**. These vertebrae are fused together to form a single structure.
- **Count**: 5 (fused)

5. **Coccygeal Vertebrae**:
- The coccyx, or tailbone, typically consists of **3 to 5 fused vertebrae**. For the sake of the vertebral formula, we can take an average of 4.
- **Count**: 4 (fused)

6. **Assembling the Vertebral Formula**:
- Now, we compile the counts from each section into a standard format. The vertebral formula is written as:
- C7 - T12 - L5 - S5 (fused) - Co4 (fused)
- Therefore, the vertebral formula of a human is: **C7 - T12 - L5 - S5 - Co4**.

### Final Answer:
The vertebral formula of humans is: **C7 - T12 - L5 - S5 - Co4**.

---