human) head. face is used when referring to physical features: a pretty face with high cheekbones. countenance, a more formal word, denotes the face as it is affected by or reveals a person's state of mind; hence, it often signifies the look or expression on the face: a thoughtful countenance.
Muscles Around the Knee. 1  Quadriceps femoris musclesâa large muscle group on the front of the thigh. 2  Vastus lateralisâpart of the quadriceps femoris on the outside-front of the thigh, it extends or straightens the leg and is controlled by the femoral nerve. Vastus lateralisâpart of the quadriceps femoris on the outside-front of the thigh, it extends or straightens the leg and is controlled by the femoral nerve. 2  Vastus intermediusâpart of the quadriceps femoris on the center-front of the thigh, it extends or straightens the leg and is controlled by the femoral nerve.
Normal knee anatomy. The patella is the bone we know as the knee cap. A groove in the end of the femur allows the patella to glide up and down when the knee joint is bent back and forth. In so doing, the patella guides the action of the quadriceps muscle in the lower leg. The patella also protects the knee joint.