Which of the following statements is not true regarding ribs in humans ?

Options

A. Rib is a flat bone connected dorsally to vertebral column
B. Ribs are ventrally connected to sternum through hyaline cartilage
C. Vertebro - chondral ribs directly articulate with sternum with the help of hyaline cartilage
D. In humans ribs are bicephalic

Answer

To solve the question regarding which statement is not true about ribs in humans, we will analyze each statement provided.

### Step-by-Step Solution:

1. **Statement Analysis**:
- **Statement A**: "Rib is a flat bone connected dorsal to vertebral column."
- This statement is **true**. Ribs are indeed flat bones and they connect to the vertebral column at the back (dorsally).

2. **Statement B**: "Ribs are ventrally connected to sternum through hyaline cartilage."
- This statement is **true**. Ribs connect to the sternum at the front (ventrally) via hyaline cartilage, which allows for flexibility.

3. **Statement C**: "Ribs vertebral condral ribs directly articulate with sternum with the help of hyaluronic acid."
- This statement is **not true**. The correct term is "vertebrochondral ribs," and these ribs do not directly articulate with the sternum. Instead, they connect to the sternum indirectly through the cartilage of the seventh rib. The mention of "hyaluronic acid" is incorrect in this context as it should refer to cartilage.

4. **Statement D**: "In humans, ribs are bicephalic."
- This statement is **true**. Ribs have two articulating surfaces: one that connects to the vertebral column and another that connects to the sternum.

5. **Conclusion**:
- The only statement that is not true regarding ribs in humans is **Statement C**.

### Final Answer:
The incorrect statement is **C**: "Ribs vertebral condral ribs directly articulate with sternum with the help of hyaluronic acid."

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