Outline the blood supply to the heart

Introduction: the heart is supplied by the right and left coronary arteries.
A. Branches from the right coronary artery
1. Conus artery
2. S.A nodal artery supplies the S.A Node
3. Right marginal artery runs towards the apex of the heart
4. A.V nodal artery supplies the A.V node
5. Posterior interventricular  artery supplies both ventricles and near the apex. It anastomoses with the anterior interventricular  artery branch of the left coronary artery
B. Branches from the left coronary artery
1. Conus artery
2. Circumflex branch supplies left ventricle and atrium
3. S.A nodal artery (40% of individuals).
4. Anterior interventricular  artery supplies both ventricles and interventricular  septum.
C. Venous drainage.
1. Great cardiac vein drains areas supplied by the left coronary artery.
2. Middle cardiac vein drains areas supplied by the right coronary artery
3. Small cardiac vein drains areas supplied by the right coronary artery
4. Oblique vein of the left atrium
5. Posterior vein of the left ventricle empties near the coronary sinus
6. Anterior cardiac vein drains the chambers of the heart
7. Venae cordis minimae (thebesian vein) drains the chambers of the heart.

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