The quadriceps, or quadriceps femoris, is made up of four muscles: the rectus femoris, the vastus intermedius, the vastus medialis and the vastus lateralis. These muscles make up the front of the thigh and extend downward over the knee.Continue Reading
According to the National Institutes of Health, the rectus femoris originates on the illium, the uppermost bone of the pelvis, and continues down the middle of the thigh. Because it connects at the hip, it is responsible for parts of hip flexion, especially when the leg remains straight. The other three muscles originate from the femur and function to straighten the knee as well as keep the patella, or kneecap, in place. The vastus intermedius lies on the front of the leg below the rectus femoris, while the vastus medialis lies on the inner part of the thigh, and the vastus lateralis lies on the outer part.
The muscles of the quadriceps are crucial to human mobility, as they allow walking, running, squatting, jumping, standing from a seated position and other movements to take place. Maintaining the strength and flexibility of the quadriceps is important not only to athletes, but also to anyone who wishes to maintain or enhance mobility. According to About.com, engaging in simple strengthening, stretching and balance exercises is the best way to keep your quadriceps functioning smoothly for years to come.Learn more about Muscles
The muscles that show up on an anatomy chart of a hamstring are the semitendinosus, the semimembranosus and the biceps femoris, according to the American Academy of Orthopaedic Surgeons. The biceps femoris is a muscle that is found at the back of the thigh, says Healthline. It has a long head and a short head.Full Answer >
The crunch exercise primarily works the rectus abdominis, transversus abdominis and oblique muscles. The rectus abdominis muscles form the six-pack and are located perpendicularly along the front of the stomach. These muscles are part of the core, which supports bending and standing up.Full Answer >
Six extraocular muscles allow the eyeballs to move: the inferior, superior, lateral and medial rectus muscles together with the inferior and superior oblique muscles. Vision Aware adds that the muscles that move the eyeballs are attached to the sclera, a white outer coating that covers the eyeball.Full Answer >
The major muscles in the human upper leg are in two groups: the hamstrings and the quadriceps. The semitendinosus, semimembranosus and biceps femoris muscles comprise the hamstrings muscle group, while the rectus femoris, vastus lateralis, vastus intermedius and vastus medialis muscles make up the quadriceps.Full Answer >