Where are the quadriceps located?

• A. Upper arm
• B. Lower leg
• C. Chest
• D. Upper thigh

Answer: (D)

The muscles called the quadriceps are a group that sits on the front of the thigh, in the upper part of the leg between the hip and the knee. That front-thigh position is why they are involved in straightening the knee—when you extend the knee you’re using these muscles. If you’ve ever felt a strong, large muscle on the front of your thigh when you kick or push your leg straight, that’s them.

Other parts of the body have different muscles: the upper arm houses muscles like the biceps and triceps, the lower leg has the calf muscles, and the chest contains the pectoral muscles. So the location described as the upper thigh is the best fit for the quadriceps.