大鼠房室束的内部构筑
THE INTERNAL ARCHITECTURE OF HIS BUNDLEIN THE RAT HEART
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摘要: 目的：探讨心传导系房室来形态学特征。方法：采用连续切片及图像分析的方法观察、测量了18例SD大鼠房室来的内部纤维构筑。结果：①大鼠房室束长平均1．08mm，可分为后方的未分叉部（0．42mm）和前面的分叉部（0．66mm）；②房室束主要由蒲氏细胞和T细胞构成；在结一束区P细胞与蒲氏细胞互相移行，无截然分界；③特化心肌纤维被胶原纤维分隔成细胞来，并以前后方向的纵行排列为主。结论：房室束由后向前纵行分离逐渐显著，纵行分离纤维束间的联系可能是房室束折返的解剖学基础。Abstract: Aim: To study the morphological features of His bundle. Method: The internal architecture of His bundle were observed and measured by serial section and image analysis in 23 rats. Results: ①The rat His bundle which was 1. 08mm long could be divided into unbranching portion in the posterior (0.42mm in length) and branching portion in the anterior (0.66mm in length). ②The His bundle is composed primarily of Purkinje cell and T cell. There was not a distinct watershed but a transition area between P cell and Purkinje cell; the number of T cell gradually decreased from the mpterior to the anterior in His bundle. ③The specialized myocardial fiber was partitioned into multiple strands by fine collagen septa, which wcre main-ly longitudinally oriented. Conclusion: IXingitudinal dissociations were gradually distinct from the pesterior part to the anterior part of His bundle. Connections between fiber strands of longiludinal diwriation may be the anatomical basic of reentry.
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