Methods: 14 adult Sorague-Dwaely (SD) rats and 14 agcd Sprngue-Dwaely rats, used as control group, were studied with immunohistochemical ABC technique, counting number of nerve intersections and with the technique of sheeting.

• 方法：应用免疫组织化学ABC法、神经交点计数法和动脉铺片技术对14只成年Sprague-Dwacly鼠和14只老年Sprague-Dwacly鼠脑底主要动脉含降钙素基因相关肽能神经纤维的分布密度和走行方式进行分析。