The _______ _______ has two heads, one attached to the ischium and the other attached to the femur. This muscle passes along the back of the thigh on the lateral side and connects to the proximal ends of the fibula and tibia. The _________ _________ is one of the hamstring muscles, and its tendon (hamstring) feels like a lateral ridge behind the knee. This muscle flexes the knee, rotates the leg laterally, and extends the hip?