Sinoatrial node
Venous drainage: I added a bit more information for the section and two sources
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===Venous drainage=== |
===Venous drainage=== |
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Unlike most of the [[Cardiac muscle|myocardium]], the SA node lacks large epicardial veins for blood return. Instead, its venous drainage is handled primarily by a network of small venules and [[Capillary|sinusoids]]. These vessels, often referred to as [[Smallest cardiac veins|Thebesian veins]], drain deoxygenated blood directly into the right atrium.Nordick, Katie, et al. “Anatomy, Thorax, Heart Thebesian Veins.” ''PubMed'', StatPearls Publishing, 2021, www.ncbi.nlm.nih.gov/books/NBK541040/. It is thought that this network provides a degree of protection for the node.Habib, A., et al. “The Anatomy of the Coronary Sinus Venous System for the Cardiac Electrophysiologist.” ''Europace'', vol. 11, no. Supplement 5, 27 Oct. 2009, pp. v15–v21, academic.oup.com/europace/article/11/suppl_5/v15/466150, |
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There are no large [[veins]] that drain blood away from the SA node. Instead, smaller [[venule]]s drain the blood directly into the [[atrium (heart)|right atrium]].{{cite journal | last1 = Anderson | first1 = K.R. | last2 = Ho | first2 = S.Y. | last3 = Anderson | first3 = R.H. | year = 1979 | title = Location and vascular supply of sinus node in human heart | journal = Heart | volume = 41 | issue = 1| pages = 28–32 | doi = 10.1136/hrt.41.1.28 | pmid = 426954 | pmc = 514694 }} |
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==Function== |
==Function== |
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