Coronary arteries - Arterial supply of the heart

Coronary arteries

The arteries supply of the heart consist of :

1- Right coronary artery 

- the right coronary artery arises from anterior aortic sinus of ascending aorta .

- it's take a course in runs forward between the pulmonary trunk, and the right auricle, and descends vertically in the right atrioventricular groove, then continuos posteriorly to anastomosis with the left coronary artery in the posterior interventricular groove .

- Branches of the right coronary artery :

• The atrial branch ( supply the anterior and lateral surface of right atrium ), and give one small branch called ( Sinu-aterial nodal branch ) which in supply the nodal of both aterial .
•  The right conus artery ( supply the infundibulum of the right ventricle ) .
  The anterior ventricular arteries ( supply the anterior surface of right ventricle ), the marginal branch is the largest artery of them, and runs toward the apex .
• Posterior ventricular arteries ( supply the diaphragmatic surface of the right ventricle .
• The posterior interventricular artery ( supply the posterior surface of the ventricular septum except the apical part of septum, and gives branch to atrioventricular nodal ), then runs to apex of the heart .

2- Left coronary artery 

- the left coronary artery arises from posterior surface of aortic sinus of ascending aorta .

- it's take a course in passes between pulmonary trunk and left auricle, then enters atrioventricular groove to divide into the anterior interventricular arteries, and the circumflex artery .

- Branches of left coronary artery :

* The anterior interventricular arteries ( supply the right and the left ventricles with the apical part of the ventricular septum ), it's gives three branches :

• Medial branch of left descending artery .
• Lateral branch of left descending artery ( diagonal ) .
• Left conus artery .

* The circumflex artery ( supply the left atrium and ventricle ), it's gives three branches :

• A left marginal artery ( the largest branch ) .
• Anterior and posterior ventricular branches . 
• A left atrial branches ( supply the left atrium ) .

  Coronary arteries

Branch	Origin
Right coronary artery	ascending aorta
Left coronary artery	ascending aorta
Sinuatrial nodal branch	Right and left coronary artery
Right marginal artery	Right coronary ( anterior ventricular )
Left marginal artery	Left coronary ( circumflex artery )
Circumflex artery	Left coronary artery
Left diagonal artery	Left coronary artery ( anterior interventricular )
Atrioventricular nodal branch	The right coronary artery
Aterioventricular bundle branch	The right coronary artery
Left conus artery	Left coronary artery ( anterior interventricular )
Right conus artery	Right coronary artery

 

 Sources :

- Snell anatomical book, 8 Edition ( 86 - 87 ) .
- Grants anatomical book, 13 Edition ( 56 - 58 ) .
- Atlas of Human Anatomy, 6 Edition- Frank H. Netter, M.D ( Plate 215 – 216 ) . 

- Coronary circulation, From Wikipedia, the free encyclopedia

Written by Mubark A.Wilkins

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