目的　观察人心脏传导系统中神经纤维的分布。方法　采用免疫组织化学显示 10例正常人心脏传导系统中的神经丝蛋白。结果　在心传导系统中可见到大量神经丝蛋白免疫阳性神经纤维 ,主要位于血管周围和结细胞间 ;窦房结和房室结周围神经节中的部分神经细胞也呈免疫阳性反应。结论　人心脏传导系统中含有丰富的神经组织 ,对心脏的生理功能可能具有重要作用。 Objective To observe the distribution of nerve fibers in human cardiac conduction system. Methods Immunofluorescence was used to detect neurofilament in 10 normal human cardiac conduction system. Results A large number of neurofilament-immunopositive nerve fibers were found in the cardiac conduction system, mainly located in the perivascular and junctional cells. Some neurons in the peripheral nodes of the atrial node and atrioventricular node were also immunopositive. Conclusions The human cardiac conduction system is rich in nerve tissue and may play an important role in the physiological function of the heart.