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| {{Infobox Artery |
| | #redirect[[left circumflex artery]] |
| Name = {{PAGENAME}} |
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| Latin = ramus circumflexus arteriae coronariae sinistrae |
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| GraySubject = 142 |
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| GrayPage = 547 |
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| Image = Gray491.png |
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| Caption = Base and diaphragmatic surface of heart. (Circumflex branch not visible, but would be near the [[coronary sinus]].) |
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| Image2 = Gray495.png |
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| Caption2 = Base of ventricles exposed by removal of the atria. (Circumflex branch not visible, but bifurcation of left coronary artery visible at left.) |
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| BranchFrom = [[left coronary artery]] |
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| BranchTo = [[left atrial branch]]<BR>[[left marginal artery]]<BR>[[sinuatrial nodal artery]] (in some people) |
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| Vein = |
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| Supplies = |
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| MeshName = |
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| MeshNumber = |
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| DorlandsPre = r_02 |
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| DorlandsSuf = 12689380 |
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| }}
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| {{SI}}
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| {{CMG}}
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| The "LCX", or '''left circumflex artery''' (or '''circumflex artery''', or '''circumflex branch of the [[left coronary 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]].
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| The circumflex artery curves to the left around the [[heart]] within the [[coronary sulcus]], giving rise to one or more diagonal or "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 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.
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| It gives off [[obtuse marginal branches]] (OM).
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| ==Structures Supplied==
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| The LCX supplies the posterolateral LV and the anterolateral [[papillary muscle]].
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| It also supplies the [[sinoatrial nodal artery]] in 38% of people.
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| 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#Coronary_artery_dominance|Coronary circulation]] for description of dominance.)
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| ==External links==
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| * {{SUNYAnatomyFigs|20|03|03}} - "Anterior view of the heart."
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| * {{SUNYAnatomyFigs|20|04|01}} - "Posterior view of the heart."
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| * {{SUNYAnatomyLabs|20|09|01|04}} - "Heart: The Left Coronary Artery and its Branches"
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| * {{GPnotebook|-442892231}}
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| * {{eMedicineDictionary|circumflex+branch+of+left+coronary+artery}}
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| * [http://www.merck.com/media/mmhe2/figures/fg020_2.gif Image at merck.com]
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| * [http://www.cardiologysite.com/html/cx.html Overview and diagrams at cardiologysite.com]
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| {{Gray's}}
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| {{Arteries of chest}}
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| [[Category:Cardiology]]
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| [[Category:Anatomy]]
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| [[Category:Cardiovascular anatomy]]
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| [[Category:Arteries]]
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