The sigmoid notch is present in

Options

A. Femur
B. Tibio-fibula
C. Humerus
D. Radio-ulna

Answer

To determine where the sigmoid notch is present, follow these steps:

1. **Identify the Options**: The question provides four options: femur, tibiofibula, humerus, and radio-ulna.

2. **Understand the Sigmoid Notch**: The sigmoid notch is a specific anatomical feature found in certain bones. It is important to know which bones are associated with this notch.

3. **Analyze Each Option**:
- **Femur**: This is the thigh bone and does not have a sigmoid notch.
- **Tibiofibula**: This refers to the combined structure of the tibia and fibula, which also does not have a sigmoid notch.
- **Humerus**: This is the upper arm bone, and it does not contain a sigmoid notch.
- **Radio-ulna**: The sigmoid notch is specifically found on the ulna bone, where it articulates with the radius. It is also referred to as the radial notch.

4. **Conclusion**: Based on the analysis, the sigmoid notch is present in the radio-ulna.

5. **Final Answer**: The correct answer is **radio-ulna**.