The sciatic nerve begins at the lower spine before going through the butt cheek, down the back of the thigh and into the foot. It's an imperative nerve that sends signals from the spinal line to the whole lower body.…The sciatic nerve begins at the lower spine before going through the butt cheek, down the back of the thigh and into the foot. It's an imperative nerve that sends signals from the spinal line to the whole lower body.WWWW…