Humerus differs from femur in having a

Options

A. sigmoid notch
B. glenoid cavity
C. deltoid ridge
D. spine

Answer

To answer the question "Humerus differs from femur in having a", we will follow these steps:

### Step 1: Identify the Bones
- The humerus is the bone located in the upper arm, while the femur is the bone located in the upper leg.

### Step 2: Understand the Key Features
- The humerus has specific features that differentiate it from the femur. One of these features is the presence of the deltoid ridge.

### Step 3: Define the Deltoid Ridge
- The deltoid ridge is a bony prominence on the humerus that serves as a site for muscle attachment, specifically for the deltoid muscle.

### Step 4: Compare with Femur
- The femur, on the other hand, does not have a deltoid ridge. Instead, it is known for being the longest and strongest bone in the human body.

### Step 5: Eliminate Other Options
- Other options such as the sigmoid notch and glenoid cavity do not apply to the comparison between the humerus and femur. The sigmoid notch is found on the ulna, and the glenoid cavity is part of the shoulder joint.

### Conclusion
- Therefore, the correct answer is that the humerus differs from the femur in having a **deltoid ridge**.