Circumflex branch of left coronary artery

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Artery: Circumflex branch of left coronary artery
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Base and diaphragmatic surface of heart. (Circumflex branch not visible, but would be near the coronary sinus.)
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Base of ventricles exposed by removal of the atria. (Circumflex branch not visible, but bifurcation of left coronary artery visible at left.)
Latin ramus circumflexus arteriae coronariae sinistrae
Gray's p.547
Supplies posterolateral left ventricle, anterolateral papillary muscle, the sinoatrial nodal artery in 38% of people.
Source left coronary artery
Branches left atrial branch
left marginal artery
posterolateral artery
sinuatrial nodal artery (in some people)
posterior interventricular artery (in some people)

The "LCX", or left circumflex artery (or circumflex artery, or circumflex branch of the left coronary artery) is an artery of the heart.

Course[edit]

It 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.

Branches[edit]

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 (OM)) 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.[1]

Structures supplied[edit]

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.)

Additional images[edit]

Coronary arteries (labeled in red text) and other major landmarks (in blue text). Left circumflex artery is labeled at right.

References[edit]

  1. ^ Agur, Keith L. Moore, Arthur F. Dalley, Anne M.R. (2010). Clinically oriented anatomy (6th ed. ed.). Philadelphia: Wolters Kluwer Health/Lippincott Williams & Wilkins. p. 145. ISBN 9780781775250. 

External links[edit]

This article incorporates text from a public domain edition of Gray's Anatomy.