ANATOMY

Detailed explanation-1: -Your quad muscles, or quadriceps femoris, are a group of muscles at the front of your thigh. Together, they contain more mass than any other muscle group in your body. You use your quads to perform a variety of movements, including kicking, running, jumping and walking.

Detailed explanation-2: -Quadriceps include four large muscles located in the front of the thigh: vastus lateralis, vastus medialis, vastus intermedius, and rectus femoris. They start at the pelvis (hip bone) and femur (thigh bone) and extend down to the patella (kneecap) and tibia (shin bone).

Detailed explanation-3: -But your quadriceps femoris is actually a group of four muscles located at the front of your thigh. In fact, that’s how it got its name. Quadriceps is the Latin word for “four-headed.” Your quadriceps are some of the largest and strongest muscles in your body.

Detailed explanation-4: -The quadriceps femoris is a group of four muscles: vastus medialis, vastus lateralis, vastus intermedius, and the rectus femoris. It is the primary extensor of the knee. The iliopsoas does not cross the knee joint and is responsible for flexion of the thigh and the ability to laterally rotate at the hip.

Detailed explanation-5: -Rectus femoris. Vastus lateralis. Vastus medialis. Vastus intermedius (see links for further elaboration)