Arterial Supply to the Heart

The arterial supply to the heart is provided via the coronary arteries, which are shown in the diagram below:

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The left and right coronary arteries both arise from small openings just above two of the aortic semilunar valves.  The right coronary artery arising from above the right anterior cusp, and the left coronary artery arising from above the posterior cusp.

The left and right coronary arteries anastomose together on the posterior of the heart.

The right coronary artery, and its branches, supply the right atrium, the right ventricle, and also part of the left ventricle.  The left coronary artery supplies most of the left ventricle, and part of the left atrium.  Occlusions (blockages) of the left coronary artery are more serious than occlusions of the right.

The left coronary artery is usually larger than the right.

 

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