Muscles in the human body serve to force movement in the body. The vastus intermedius muscle is located along the upper portion of the femur, which is also known as the thigh bone. The muscle covers the front part of the femur and the side of the femur. It is directly underneath and ends at the rectus femoris muscle, which is part of the quadriceps. The muscle is closely related to the vastus medialis muscle and may look attached to that muscle. When the rectus femoris flexes, a small area is visible between the two muscles. The two muscles move in a continuous line, but each is a separate muscle. It is hard to stretch the muscle because of its location in the quadriceps. Hip extension exercises fail to work the muscle and massage therapy cannot reach the muscle. Patients with vastus intermedius muscle strain or other problems may require special surgery to repair the damage or exercises to slowly work out any strains.
Written and medically reviewed by the Healthline Editorial Team
In Depth: Vastus intermedius