成人房室结的亚显微构造

THE ULTRASTRUCTURE OF THE ADULTS’A-V NODES

关于心脏传导系的研究历史,虽然已有七、八十年,但是对于其超微结构的探讨,只是最近二、三十年才开始的。在五十年代末和六十年代初,一些学者曾对脊椎动物的心脏传导系的超微构造进行了研究,如Muir^([1])和Kawamura^([2])等。由于心传导系的形态构造较小,用于电子显微镜研究需要的组织大约是1立方毫米,因此,取得可靠组织,是比较困难的。另外,这些组织的死后变化,也是研究人心传导系的一个障碍。由于上述原因,对于人心传导系亚显微构造的研究相对地较少。在国外,James^([3~5])等人曾对人心的窦房结和房室结以及房室束的超微结构,进行过比较系统的研究。在国内,尚未见到这方面报道。探讨心传导系的结构与心律失常发病机理的关系等都需要其超微结构的有关知识。

Observation had been made on two male adults’hearts.Under electron microscopy,it is found that the A-V node consists of three types of cells,i.e.P cells,transitional cells and Purkinje cells.Because the specimen was cut from the central part of the A-V node,therefore the general myocardial cells were not observed.One of characteristics distingui-shed from the sino-atrial node is the presence of a few Purkinje cells in the A-V node.The number of P cells is far less than S-A node,and the transitional cells are predominant.In the interstitial tissues of the A-V node,the collagenous fibers are not so much as in S-A node but a numbers of capillarie,fibroblasts,mast cells and non-medul-lated nerve fibers can be seen.