Time grew , the adjustment that can bring about pallium again the function is disorder , parasympathetic nerve centre is met " seize the opportunity " come out from the disengagement below the control of pallium , stimulant increase , the alvine path exercise that gets it to control is accelerated , patient occurrence diarrhoea ; this nerve excitement is too long , but because of " fatigue " and ebb gradually and turn to restrain , alvine path muscle also comes down flabbily slowly , peristalsis is abate , the result causes constipation again 时间长了，又可导致大脑皮层的调节功能紊乱，副交感神经中枢便会“乘机”从大脑皮层的控制下解脱出来，兴奋性增强，受它支配的肠道运动加快，病人出现腹泻；该神经兴奋过久，可因“疲惫”而逐渐衰退并转为抑制，肠道肌肉也就慢慢地松弛下来，蠕动减弱，结果又引起便秘。
