Left coronary artery

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Left coronary artery
Heart viewed from above, atria removed, base of ventricles exposed. Left coronary artery visible at left.
Coronary arteries.png
Heart viewed from the front. Coronary arteries (labeled in red text) and other major landmarks (in blue text). Left coronary artery is at upper right in the image.
Latin arteria coronaria sinistra
ascending aorta
anterior interventricular
(ramus intermedius)
Gray's p.547
TA A12.2.03.201
FMA 50040
Anatomical terminology

The left coronary artery (abbreviated LCA and also known as the left main coronary artery (abbreviated LMCA), left main stem coronary artery (abbreviated LMS), and the "Widow maker") is an artery that arises from the aorta above the left cusp of the aortic valve and feeds blood to the left side of the heart.


It typically runs for 10 to 25 mm and then bifurcates into the anterior interventricular artery (also called left anterior descending (LAD)) and the left circumflex artery (LCX). Sometimes an additional artery arises at the bifurcation of the left main artery, forming a trifurcation; this extra artery is called the intermediate artery.[1]

The part that is between the aorta and the bifurcation only is known as the left main artery (LM), while the term 'LCA' might refer to just the left main, or to the left main and all its eventual branches.

A "first septal branch" is sometimes described.[2]

Additional images[edit]

See also[edit]


  1. ^ Fuster, V; Alexander RW; O'Rourke RA (2001). Hurst's The Heart (10th ed.). McGraw-Hill. p. 53. ISBN 0-07-135694-0. 
  2. ^ Verna E, Santarone M, Boscarini M, Ghezzi I, Repetto S (June 1988). "Unusual origin and course of the first septal branch of the left coronary artery: angiographic recognition". Cardiovasc Intervent Radiol 11 (3): 146–9. doi:10.1007/BF02577106. PMID 3139296. 

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