采用NADPH－d组织化学方法，观察了NOS阳性神经元在大鼠脑扣带皮质前部24区、32区、25区和后部23区、29区的分布，并夹闭双侧颈总动脉，造成脑缺血2h后，再观察各区NOS阳性神经元的变化。结果为扣带皮质前、后部的5个区均有NOS阳性神经元。其前部的24区NOS阳性神经元较多，后部的23区和29区次之，前部的32区和25区较少。夹闭双侧颈总动脉2h后，再观察的结果为扣带皮质前、后部NOS阳性神经元数量均明显增加（P＜0．01）。 NADPH-d histochemistry was used to observe the distribution of NOS positive neurons in the anterior 24, 32, 25 and posterior 23 and 29 posterior regions of rat cingulate cortex, and the bilateral common carotid arteries were occluded , Causing cerebral ischemia 2h, and then observe the changes of NOS positive neurons in each district. The results showed that there were NOS positive neurons in the 5 regions before and after the cingulate cortex. There are more NOS positive neurons in the front 24 regions, followed by the 23 and 29 regions in the back, and less in the front 32 and 25 regions. After occluding bilateral common carotid arteries for 2 hours, the number of NOS positive neurons in the anterior and posterior cingulate cortex increased significantly (P <0.01).