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1. ANATOMY AND PHYSIOLOGY
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CORONARY CIRCULATION
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2. Coronary arteries
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 2 - Right and left
 Arise from the ascending aorta
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3. 3 www.medicinemcq.com

4. 4 www.medicinemcq.com

5. Coronary circulation is end-
arterial
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 Anastomosis between right and left coronary
arteries
 Insignificant
 May become prominent in coronary artery
disease
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6. Right coronary supplies
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 Most of the right ventricle
 Right atrium
 Conducting system
 Posterior third of the IVS
 Part of the left ventricular diaphragmatic
aspect
 Part of the left atrium
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7. Left coronary supplies
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 Most of the left ventricle
 Most of the left atrium
 Anterior two-thirds of the IVS
 Narrow strip of right ventricle
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8. AV node usually supplied by
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 RCA - 85%
 LCA – 15%
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9. Left coronary artery
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 Divides into two main rami in the
atrioventricular or coronary sulcus
 Anterior interventricular (descending) ramus
 Descends in the interventricular sulcus and reaches the
apex
 Turns round the apex into the posterior interventricular
sulcus
 Meet the terminal twigs of the posterior interventricular
artery of the right coronary artery
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10. Circumflex artery
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 Runs left in the atrioventricular sulcus
 Continues round the left cardiac border into
the posterior part of the atrioventricular
sulcus
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