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首页> 外文期刊>Heart and vessels: An international journal >Structural differences in the cytoarchitecture and intercalated discs between the working myocardium and conduction system in the human heart.
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Structural differences in the cytoarchitecture and intercalated discs between the working myocardium and conduction system in the human heart.

机译：工作心肌和人心脏传导系统之间的细胞结构和插入盘之间的结构差异。

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摘要

Working and specialized cardiac myocytes and their intercalated discs in adult human hearts without history of cardiac disease were examined by scanning electron microscopy. The NaOH/ultrasonication treatment of cardiac tissues resulted in the digestion of connective tissue and separation of intercellular junctions. Auricular and ventricular working cardiac myocytes were quasi-cylindrical in shape, bifurcated, and connected end-to-end at the intercalated discs. The intercalated discs in the working cardiac myocytes showed a stair-like profile, consisting of steps (plicate segments) and corresponding risers (interplicate segments). The ventricular myocytes, in particular, had many steps and risers. The plicate segments were filled with numerous finger-like microprojections. The strands of the myocytes in the sinoatrial node were oriented linearly, while those in the atrioventricular node formed a reticular network. The intercalated discs in both nodal cells were underdeveloped, having few microprojections. Myocytes in the atrioventricular bundle (His) and the right limb were arranged in parallel, and were characterized by the presence of slender branches. Purkinje cell strands formed reticular networks. The intercalated discs in the His-Purkinje system were irregular in appearance, and the microprojections were larger in size and smaller in number than those of working myocytes. The myocytes in the crista terminalis and surrounding the fossa ovalis resembled cells in the His-Purkinje system rather than auricular working myocytes in morphology, and may act as the internodal pathway. It is concluded that morphological differences in both the cytoarchitecture and intercalated discs were closely related with contraction and impulse propagation in the various regions of the human heart.
机译：通过扫描电子显微镜检查了没有心脏病史的成年人类心脏中的正常工作的和专用的心肌细胞及其插入的椎间盘。 NaOH /超声处理心脏组织导致结缔组织的消化和细胞间连接的分离。耳廓和心室工作心肌细胞的形状为准圆柱形，分叉，并在插入的椎间盘处首尾相连。工作心肌细胞中插入的椎间盘呈阶梯状，由台阶（重复段）和相应的竖板（重复段）组成。尤其是心室肌细胞有许多台阶和上升管。 segments节段充满了许多手指状的微突。窦房结中的肌细胞链呈线性排列，而房室结中的肌细胞形成网状网络。两个节细胞中的插入盘均不发达，几乎没有微突出物。房室束（His）和右肢中的心肌细胞平行排列，其特征是存在细长的分支。浦肯野细胞链形成网状网络。 His-Purkinje系统中插入的椎间盘外观不规则，并且微突出物的大小比工作的心肌细胞大，而数目小。 cr末端和卵圆窝周围的心肌细胞在形态上类似于His-Purkinje系统中的细胞，而不是耳廓工作性心肌细胞，并且可能充当结间途径。结论是，细胞结构和嵌入盘的形态差异与人心脏各个区域的收缩和冲动传播密切相关。

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