Results: Adrenergic fibers largely exist in adult cardiac conduction system,which mainly located in atrionector,little in atrioventricular node,and less in atrioventricular bundle.

• 结果:在心脏传导系统中可见大量肾上腺素能神经纤维,以窦房结最多,房室结次之,而房室束极少。