The longest muscle in the human body is

Options

A. gluteus maximus
B. stapedial muscle
C. sartorius muscle
D. gastrocnemius muscle

Answer

To determine the longest muscle in the human body, we can analyze the given options step by step.

### Step-by-Step Solution:

1. **Identify the Options**: The question provides four options:
- Gluteus maximus
- Stapedius muscle
- Sartorius muscle
- Gastrocnemius muscle

2. **Evaluate Each Option**:
- **Gluteus Maximus**: This is the largest muscle in terms of mass and is located in the hip region. However, it is not the longest muscle.
- **Stapedius Muscle**: This is a very small muscle located in the middle ear. It is not long at all.
- **Sartorius Muscle**: This muscle is known to be the longest muscle in the human body. It is a thin muscle that runs down the length of the upper thigh.
- **Gastrocnemius Muscle**: This muscle is located in the calf of the leg. While it is a significant muscle, it is not the longest.

3. **Conclusion**: After evaluating all the options, the **Sartorius muscle** is identified as the longest muscle in the human body, as it runs from the hip to the knee along the thigh.

### Final Answer:
The longest muscle in the human body is the **Sartorius muscle**.

---