The quadriceps femoris consists of four individual muscles – the three vastus muscles and the rectus femoris. It forms the main bulk of the anterior thigh, and is one of the most powerful muscles in the body. Learn about the four muscles that cover the front and sides of your thighs, their structure, function, and common injuries. The quadriceps help you straighten your knee, stabilize your kneecap, and move in bed. Your quadriceps are a group of four muscles located at the front of your thigh. These muscles work together to help you stand, walk, run, and move with ease. They're among the largest and ... What is the Quadriceps Femoris The quadriceps femoris, commonly known as the quadriceps or just “quads”, is a group of four muscles located at the front of the thigh. The name “ quadriceps ” comes from Latin, meaning “four-headed,” a reference to the four muscles that originate from different points but merge to form a single tendon. Together, they make up the quadriceps complex. This is one of the strongest and largest muscle groups in the human body. With a shared attachment at ...