How many vertebra-chondral ribs are present in the human ?

Options

A. 7 pairs
B. 2 pairs
C. 3 pairs
D. 12 pairs

Answer

To determine the number of vertebra-chondral ribs present in humans, follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Human Ribs**:
- Humans have a total of 12 pairs of ribs. These ribs are categorized into three types based on their attachment to the sternum.

2. **Identify the Types of Ribs**:
- **True Ribs**: The first seven pairs (1st to 7th) are known as true ribs. They directly attach to the sternum.
- **False Ribs**: The next three pairs (8th to 10th) are considered false ribs. They do not attach directly to the sternum but connect indirectly through cartilage.
- **Floating Ribs**: The last two pairs (11th and 12th) are floating ribs, which do not attach to the sternum at all.

3. **Focus on Vertebra-Chondral Ribs**:
- The vertebra-chondral ribs refer specifically to the false ribs (8th to 10th pairs) because they articulate with the vertebrae and connect to the sternum via cartilage.

4. **Count the Vertebra-Chondral Ribs**:
- Since there are three pairs of false ribs (8th, 9th, and 10th), this means there are **3 pairs of vertebra-chondral ribs** in humans.

5. **Conclusion**:
- Therefore, the answer to the question is that there are **3 pairs of vertebra-chondral ribs** in the human body.

### Final Answer:
**3 pairs of vertebra-chondral ribs are present in humans.**

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