• Flexion of the hip
  • Extension of the knee
the femoral rectum and sartorius are the only muscles quadriceps in the group that are involved in the flexion of the hip, since they are only which they have his origin in pelvis and femur no. When crossing the femoral pelvic joint can act like a handle to flex the leg in the hip.
The femoral rectum is weakest a flexor muscle of the hip when the knee extends because already it is reduced and therefore it suffers of active insufficiency. In essence: the action to raise to a prim leg will contract to more greater iliac, psoas, the tension of fascia broad, and the flexors of the hip rest of which it will be the femoral rectum.
In the same way, the femoral rectum is not dominant in the extension of the knee when flexes the hip, because it is already reduced and therefore it suffers of active insufficiency. In essence: the action of the extension of a section of a seated position, is based fundamentally on vast lateral, vast the medial and vast interval, and less by the femoral rectum.
The femoral rectum is considered a direct antagonist in the sinews. The hamstring are against to the previous rectum of the thigh in the joint of the hip by means of the extension and in the joint of the knee through the flexion. The femoral rectum can be torn in which it can be very painful.