Circumflex branch of left coronary artery
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Template:Main other Script error: No such module "Infobox".Template:Template otherTemplate:Main otherScript error: No such module "Check for unknown parameters". The circumflex branch of left coronary artery (also known as the left circumflex artery or circumflex arteryScript error: No such module "Unsubst".) is a branch of the left coronary artery. It winds around the left side of the heart along the atrioventricular groove (coronary sulcus). It supplies the posterolateral portion of the left ventricle.[1]
In a minority of individuals, the left circumflex artery gives rise to the posterior interventricular artery, in which cases such a heart is deemed left dominant.[1]
Anatomy
The left circumflex artery follows the left part of the coronary sulcus, running first to the left and then to the right, reaching nearly as far as the posterior longitudinal sulcus. There have been multiple anomalies described, for example the left circumflex having an aberrant course from the right coronary artery.[2]
Branches
The circumflex artery curves to the left around the heart within the coronary sulcus, giving rise to one or more left marginal arteries (also called obtuse marginal branches) as it curves toward the posterior surface of the heart. It helps form the posterior left ventricular branch or posterolateral artery. The circumflex artery ends at the point where it joins to form to the posterior interventricular artery in 15% of all cases, which lies in the posterior interventricular sulcus. In the other 85% of all cases the posterior interventricular artery comes out of the right coronary artery.[3] When the left circumflex supplies the posterior descending artery in those 15% of cases, it is known as a left dominant circulation.
Distribution
Script error: No such module "labelled list hatnote". The circumflex artery supplies the posterolateral left ventricle and the anterolateral papillary muscle.
It also supplies the sinoatrial nodal artery in 38% of people.
It supplies 15–25% of the left ventricle in right-dominant systems. If the coronary anatomy is left-dominant, the circumflex artery supplies 40–50% of the left ventricle.
Additional images
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Coronary arteries (labeled in red text) and other major landmarks (in blue text). Left circumflex artery is labeled at right.
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Cardiac vessel schematic
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Human heart with coronary arteries
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Heart coronary territories
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Heart left lateral coronaries diagram
References
Public domain This article incorporates text in the public domain from Template:Wikidatathe 20th edition of Gray's Anatomy (1918) Template:Main other Template:Reflist
External links
- Anatomy figure: 20:03-03 at Human Anatomy Online, SUNY Downstate Medical Center – "Anterior view of the heart."
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- Anatomy figure: 20:04-01 at Human Anatomy Online, SUNY Downstate Medical Center – "Posterior view of the heart."
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- Anatomy photo:20:09-0104 at the SUNY Downstate Medical Center
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Template:Rcat shell – "Heart: The Left Coronary Artery and its Branches"
Template:Arteries of chest Template:Portal bar Template:Authority control