Olecranon fossa is present over

Options

A. Radius
B. Ulna
C. Humerus
D. Femur

Answer

To determine where the olecranon fossa is located, we can analyze the options provided:

1. **Understanding the Options**:
- **Radius**: This is one of the two bones in the forearm, located on the thumb side.
- **Ulna**: This is the second bone in the forearm, located on the side opposite the thumb.
- **Humerus**: This is the bone of the upper arm, connecting the shoulder to the elbow.
- **Femur**: This is the thigh bone, the longest bone in the human body.

2. **Analyzing Each Option**:
- **Radius**: The olecranon fossa is not present on the radius. The radius is located in the lower arm and does not have this specific fossa.
- **Ulna**: Similar to the radius, the ulna does not have the olecranon fossa. It is also a forearm bone and does not feature this depression.
- **Humerus**: The olecranon fossa is located on the posterior aspect of the humerus. It is a large depression that accommodates the olecranon of the ulna when the arm is extended.
- **Femur**: The femur is located in the thigh and does not have the olecranon fossa.

3. **Conclusion**:
- The olecranon fossa is present on the **humerus**. Therefore, the correct answer is **humerus**.