Pavlovich E R
Arkh Anat Gistol Embriol. 1984 Mar;86(3):40-6.
A quantitative electron microscopical investigation has revealed reliable differences in contents of muscular, connective tissue and neural elements in the conductive system, on the one hand (in the atrioventricular node and in the internodal specialized pathways) and in the working myocardium of the inferior third of the interatrial septum, on the other hand. Morphometrical analysis of the neuromuscular interrelations, performed separately for every type of specialized conductive myocytes (II, III) and of working cardiomyocytes of the interatrial septum, reveals some differences in size of the neural fibers and their terminals and in distance between them and myocytes. The synaptic vesicles of the efferent terminals are qualitatively different in all types of the myocytes. The afferent terminals situating near specialized cardiac cells are characterized. Criteria for distinguishing small and large granular vesicles in the terminals are discussed. A suggestion is made that the innervational peculiarities revealed reflect certain specificity in regulation the conduction in the atrioventricular area of the heart.
定量电子显微镜研究揭示了一方面在传导系统（房室结和结间特殊传导通路）中，另一方面在房间隔下三分之一的工作心肌中，肌肉、结缔组织和神经成分含量存在可靠差异。对每种特殊传导性心肌细胞（II型、III型）以及房间隔工作心肌细胞分别进行的神经肌肉相互关系的形态计量分析显示，神经纤维及其终末的大小以及它们与心肌细胞之间的距离存在一些差异。在所有类型的心肌细胞中，传出终末的突触小泡在性质上有所不同。对位于特殊心肌细胞附近的传入终末进行了表征。讨论了区分终末中小颗粒小泡和大颗粒小泡的标准。有人提出，所揭示的神经支配特性反映了心脏房室区域传导调节中的某些特异性。
