Petrescu Codruţa Ileana, Niculescu V, Ionescu N, Vlad M, Rusu M C
Department of Anatomy and Embryology, "Victor Babeş" University of Medicine and Pharmacy, Timişoara.
Rom J Morphol Embryol. 2006;47(1):59-61.
The importance of the sinus node as the cardiac pacemaker is well known. The aim of the present study was to investigate the microangioarchitecture at the level of the sinus node. Ten human adult hearts were injected with India ink in the initial segments of the coronary arteries. Pieces were drawn and diaphanized. The results of the study can be summarized: (1) the sinus node is rather an irregularly shaped structure, with peripheral strands intermingling with strands of the atrial myocardium; at this level two vascular patterns can be recognized: (a) the myocardial capillary networks that parallels the muscular bundles, and (b) the peripheral nodal networks built upon dichotomizing arterioles; (2) it seems that while the thick and large sinus node artery does not branch in the nodal tissue, the blood supply of this tissue is ensured by the peripheral nodal networks; (3) characteristically, in the periphery of the nodal tissue are largely present glomeruli made by capillaries with pericellular dispositions. The results strongly suggest that the nodal tissue is mainly supplied from its periphery and the sinus node artery is rather a scaffold than a supplier of that tissue.
窦房结作为心脏起搏器的重要性是众所周知的。本研究的目的是研究窦房结水平的微血管结构。对10例成人心脏的冠状动脉起始段注入印度墨水。将组织块绘图并进行透明处理。研究结果可总结如下：（1）窦房结是一个形状不规则的结构，其周边纤维与心房肌纤维相互交织；在此水平可识别出两种血管模式：（a）与肌束平行的心肌毛细血管网，以及（b）基于二分小动脉构建的周边结内网络；（2）虽然粗大的窦房结动脉不在结内组织分支，但该组织的血液供应由周边结内网络确保；（3）其特点是，在结内组织周边大量存在由具有周细胞排列的毛细血管构成的肾小球。结果有力地表明，结内组织主要由其周边供血，窦房结动脉与其说是该组织的供血者，不如说是一个支架。
