<P> Femoral nerve (L2, L3, L4). </P> <P> All four quadriceps are powerful extensors of the knee joint . They are crucial in walking, running, jumping and squatting . Because the rectus femoris attaches to the ilium, it is also a flexor of the hip . This action is also crucial to walking or running as it swings the leg forward into the ensuing step . The quadriceps, specifically the vastus medialis, play the important role of stabilizing the patella and the knee joint during gait . </P> <P> In strength training, the quadriceps are trained by several leg exercises . Effective exercises include the squat and leg press . The isolation movement (i.e. targets solely the quadriceps) is the leg extension exercise . </P> <P> In body building communities, this muscle is colloquially referred to as the "leg triceps". </P>

Which of the following muscles is not part of the quadriceps femoris muscle group