Compared with those in control group,nitric oxide synthase(NOS) positive neurons were increased in OECs group,decreased in L-NNA group,and were no difference in OECs+L-NNA group.

• 与对照组比较,OECs组L1背核NOS阳性神经元增加,L-NNA组NOS阳性神经元减少,OECs+L-NNA组NOS阳性神经元数量差异不明显。