Which muscle of the quadriceps group is located on the lateral surface of the lower extremity?

Rationale

Vastus lateralis is located on the lateral surface of the lower extremity.

The vastus lateralis is one of the four muscles that make up the quadriceps group and is specifically positioned on the outer side of the thigh. This placement allows it to play a crucial role in extending the knee joint.

A (Vastus lateralis) CORRECT

This muscle is part of the quadriceps group and is situated on the lateral aspect of the thigh. It is responsible for knee extension and is the correct answer to the question regarding the muscle located on the lateral surface of the lower extremity.

B (Gastrocnemius) YOUR ANSWER

The gastrocnemius is primarily located at the back of the lower leg and forms part of the calf muscle. While it aids in plantarflexion of the foot, it is not a quadriceps muscle and does not occupy a lateral position in the lower extremity, making it an incorrect choice.

C (Anterior tibialis) YOUR ANSWER

The anterior tibialis is found on the front of the lower leg, primarily responsible for dorsiflexion of the foot. Though it is a muscle of the lower extremity, its position is not lateral—it is more medial and anterior, which disqualifies it as the answer.

D (Rectus femoris) YOUR ANSWER

The rectus femoris is another muscle in the quadriceps group, but it is located more centrally in the thigh, running down the front of the femur. It plays a key role in knee extension and hip flexion but does not have a lateral position, thus making it an incorrect option.

Conclusion

The vastus lateralis is the only muscle among the options provided that is situated on the lateral side of the lower extremity. It is integral to the function of the quadriceps group, specifically in knee extension. The other choices, while relevant to the lower extremity, do not share the same lateral positioning or muscular group affiliation as the vastus lateralis.

Which muscle of the quadriceps group is located on the lateral surface of the lower extremity?

Vastus lateralis is located on the lateral surface of the lower extremity.

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