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家兔房室隔内过渡细胞束的形态学观察(PDF)

《心脏杂志》[ISSN:1009-7236/CN:61-1268/R]

期数:
2003年第2期
页码:
104-108
栏目:
实验研究
出版日期:
2003-03-01

文章信息/Info

Title:
Observation on morphology of the transitional cellular bundle in rabbits atrioventricular septum
作者:
谢松梅1; 牛小麟1; 凌凤东2
西安交通大学:1.第二医院,陕西 西安 710004,2.解剖学教研室,陕西 西安 71006
Author(s):
XIESong-mei1; NIUXiao-lin1; LINGFeng-dong2
1.Department of Cardiology,Second Hospital of Xi'an Jiao tong University,Xi'an,Shaanxi 710004,China;2.Department of Anatomy,Xi'an Jiao tong University,Xi'an,Shaanxi 710061, China
关键词:
房室结双径路; 房室结; 结后延伸; 房结束; 过渡细胞
Keywords:
dual atrioventricular nodal pathways;  atrioventricular node;  posterior nodal extension; atrial nodal bundle; transitional cell
分类号:
R322.1
DOI:
-
文献标识码:
A
摘要:
目的:探讨房室结双径传导的形态学基础。方法:选用家兔10只,分别做房室隔的水平面和额状面的连续切 片,光镜下观察其组织形态学特征。结果:①房室结(AVN)由形态结构不同的3层细胞组成,浅层细薄,由普通房肌 细胞和过渡细胞(TC)组成,波浪形疏松平行排列;中层较厚,排列致密且交织成网,由TC和起搏细胞(PC)组成; 深层肌纤维较粗且有交错,由TC和PC组成;3层均以TC为主。②AVN后方可见一大束疏松排列的过渡细胞束, 为结后延伸(PNE)。③房室交界区心房扩展部可见4条主要由TC构成的房结束(ANB)。它们分别走行于AVN的 右下方,右后方,左方和上方。④AVN,PNE,ANB均主要由TC构成,而TC直径小于普通房肌细胞。结论:①AVN 浅层的传导速度可能快于中、深层。②ANB、PNE可能为房室结双径中的慢径提供了形态学基础。
Abstract:
AIM:To investigate the morphological basis underlying dual atrioventricular nodal pathways(DAVNP) of conduction.METHODS:The histological features of the atrioventricular septum often rabbits were observed under light microscope by means of serial sections. RESULTS:① AVN was composed of three layers of cells with different structures.The superficial layer was slender and parallelly arranged.It was mostly composed of transitional cells (TC) besides a few ordinary atrial myocytes.The middle layer was tightly packed and interlocked.The deep layer was interlocked.The middle and deep layers were mostly composed of TC besides some pacing cells.② A posterior nodal extension(PNE),which was composed of a large transitional cellular bundle was found in all preparations studied and linked forward to AVnode. At the atrial extension part, four transitional cellular bundles were found linked forward with PNE or AVN respectively from the right-inferior,right posterior,left and superior of AVN.We called them atrial nodal bundle (ANB). Similarly AVN, PNE and ANB were also mostly composed of TC.The diameter of TC was smaller than that of the ordinary atrial myocyte.CONCLUSION: ①The conduction velocities of the superficial layer of AV node may be greater than those of the middle and deep layers.②ANB and PNE may provide the morphological basis for the slow pathways of DAVNP

参考文献/References

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备注/Memo

备注/Memo:
收稿日期：2002-7-5.
更新日期/Last Update: 2003-03-01