Quadriceps | Health Dictionary

(More accurately quadriceps femoris) – the large, four-headed muscle occupying the front and sides of the thigh, which straightens the leg at the knee-joint and maintains the body in an upright position. It comprises the rectus femoris, vastus lateralis, vastus intermedius and vastus medialis.

Quadriceps | Health Dictionary

Keywords of this word: Quadriceps

Medical Dictionary

The portion of the lower limb above the knee. The thigh is supported by the femur or thighbone, the longest and strongest bone in the body. A large four-headed muscle, the quadriceps, forms most of the ?eshy mass on the front and sides of the thigh and serves to straighten the leg in walking as well as to maintain the erect posture of the body in standing. At the back of the thigh lie the hamstring muscles; on the inner side the adductor muscles, attached above to the pelvis and below to the femur, pull the lower limb inwards. The large femoral vessels emerge from the abdomen in the middle of the groin, the vein lying to the inner side of the artery. These pass downwards and inwards deeply placed between the muscles, and at the knee they lie behind the joint. The great saphenous vein lies near the surface and can be seen towards the inner side of the thigh passing up to the groin, where it joins the femoral vein. The femoral nerve accompanies the large vessels and controls the muscles on the front and inner side of the thigh; while the large sciatic nerve lies close to the back of the femur and supplies the muscles at the back of the thigh and muscles below the knee.

Deep wounds on the inner side of the thigh are dangerous by reason of the risk of damage to the large vessels. Pain in the back of the thigh is often due to in?ammation of the sciatic nerve (see SCIATICA). The veins on the inner side of the thigh are specially liable to become dilated.... Medical Dictionary