Greater trochanter and lesser trochanter occur in

Options

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

Answer

**Step-by-Step Solution:**

1. **Understanding Trochanters**: Trochanters are bony prominences or protrusions found on certain bones in the body. They serve as important attachment points for muscles.

2. **Analyzing the Options**: The question provides four options: humerus, femur, radio-ulna, and tibia of fibula. We need to determine which of these bones contains the greater and lesser trochanters.

3. **Evaluating the Humerus**: The humerus is the bone of the upper arm, extending from the shoulder to the elbow. It does not have any trochanters. Therefore, this option can be eliminated.

4. **Evaluating the Femur**: The femur is the thigh bone and is known to have both greater and lesser trochanters. The greater trochanter is located on the proximal and lateral part of the femur, while the lesser trochanter is found on the proximal and medial part of the femur. This option is correct.

5. **Evaluating the Radio-ulna**: The radius and ulna are the two bones of the forearm. They do not have trochanters, so this option can also be eliminated.

6. **Evaluating the Tibia of Fibula**: The tibia and fibula are the bones of the lower leg. Similar to the radius and ulna, they do not have trochanters. Thus, this option can be eliminated as well.

7. **Conclusion**: After evaluating all the options, we conclude that the greater and lesser trochanters occur in the femur.

**Final Answer**: The greater trochanter and lesser trochanter occur in the **femur**.

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