Vertebral formula for human beings is

Options

A. `C_5T_(12)L_7S_5C_(3-5)=33-35`
B. `C_7T_(12)L_5S_5C_(3-5)=33-35`
C. `C_5T_(10)L_5S_5C_(3-5)=33`
D. `C_7T_(10)L_5S_5C_(3-5)=33`

Answer

To determine the vertebral formula for human beings, we need to understand the different types of vertebrae present in the human spine. The vertebral formula is a way to represent the number of each type of vertebra in the human body.

### Step-by-Step Solution:

1. **Identify the Types of Vertebrae**:
- The human spine consists of five different regions of vertebrae: cervical, thoracic, lumbar, sacral, and coccygeal.

2. **Count the Number of Vertebrae in Each Region**:
- **Cervical Vertebrae (C)**: There are 7 cervical vertebrae.
- **Thoracic Vertebrae (T)**: There are 12 thoracic vertebrae.
- **Lumbar Vertebrae (L)**: There are 5 lumbar vertebrae.
- **Sacral Vertebrae (S)**: There are typically 5 sacral vertebrae, which are fused to form one sacrum in adults.
- **Coccygeal Vertebrae (C)**: The number of coccygeal vertebrae can vary from 3 to 5, but they are fused to form one coccyx in adults.

3. **Write the Vertebral Formula**:
- Combining these counts, the vertebral formula can be expressed as:
- C7 (cervical)
- T12 (thoracic)
- L5 (lumbar)
- S5 (sacral)
- C3-5 (coccygeal)
- Therefore, the complete vertebral formula is: **C7 T12 L5 S5 C3-5**.

4. **Calculate the Total Number of Vertebrae**:
- If we consider the coccygeal vertebrae to be 3, the total number of vertebrae would be 33 (7 + 12 + 5 + 5 + 3).
- If we consider them to be 5, the total would be 35 (7 + 12 + 5 + 5 + 5).
- Hence, the total number of vertebrae in humans can range from 33 to 35.

5. **Select the Correct Option**:
- Based on the options given, the correct vertebral formula for human beings is **C7 T12 L5 S5 C3-5**, which corresponds to the total of 33 to 35 vertebrae.

### Final Answer:
The vertebral formula for human beings is **C7 T12 L5 S5 C3-5**.

---