Left circumflex artery

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Template:Infobox Artery

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Synonyms and keywords: CX, circumflex artery, LCX, left circumflex artery, circumflex branch of the left coronary artery

Overview

The circumflex artery curves to the left around the heart within the coronary sulcus, giving rise to one or more diagonal or left marginal arteries (also called obtuse marginal branches (OM)) as it curves toward the posterior surface of the heart. It helps form the posterior leftventricular branch or posterolateral artery. The circumflex artery ends at the point where it joins to form to the posterior interventricular artery in ten percent of all cases, which lies in the posterior interventricular sulcus. In the other 90% of all cases the posterior interventricular artery comes out of the right coronary artery.

CX

The CX can be divided into three main segments (C1, C2 and C3) according to the origin of the marginal arteries. The CX segments are the following:

Structures supplied

The LCX 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 LCX supplies 40-50% of the left ventricle. (See Coronary circulation for description of dominance.)

External links

• Template:SUNYAnatomyFigs - "Anterior view of the heart."
• Template:SUNYAnatomyFigs - "Posterior view of the heart."
• Template:SUNYAnatomyLabs - "Heart: The Left Coronary Artery and its Branches"
• Template:GPnotebook
• Template:EMedicineDictionary
• Image at merck.com
• Overview and diagrams at cardiologysite.com