 Arterial Supply  Right coronary artery  Left coronary artery  Venous Drainage  Venae cordis minimis  Anterior cardiac veins  Coronary sinus

 Arterial supply

1.Right coronary artery  Origin : arise from the anterior aortic sinus  passes between the pulmonary artery& right auricle  Course :  it descends in the coronary sulcus till the inferior margin of the hear  it reaches the posterior interventricular Groove

 Branches : 1. Rt conus artery : To the conus arteriosus (infundibulub) of right ventricle 2. ventricular branch : To the anterior and inferior surfaces of heart 3. atrial Branches : to ant surface of Rg.atrium 4. artery to S.A node. 5. marginal artery : Runs along the inferior border

 Branches : 6. posterior interventricular artery :  runs in posterior interventricular groove  it gives: - ventricular branches to the adjoining parts of 2 ventricles - post 1/3 of interventricular septum - artery to A.V node & bundle Conus brs Ventricular brs AV nodal br

Right Coronary Artery

2. Left coronary artery  Origin : arise from the left posterior coronary sinus  Course :  passes between the pulmonary root & lt auricle  It reaches the coronary sinus where it gives ant interventricular artery  the main artery then curves around the lt margin of the heart & named circumflex aretry  The circumflex artery runs in the coronary sulcus posteriorly till it meets the termination of right coronary

 Branches : 1.Lt conus artery : To conus arteriosus 2. anterior interventricular artery : it gives : - ventricular branches to the adjoining parts of 2 ventricles - ant 2/3 interventricular septum 3. circumflex artery : it gives : - atrial branches to lt atrium - ventricular branches

Left Coronary Artery

 Anastomoses of the coronary arteries  Branches of the coronary arteries are functional end arteries  Anastomoses can occur in the following sites : - At the apex - In the posterior part of coronary sulcus - Along the interventricular septum

Branches of Coronary arteries 12

Branches and anastomoses of coronary artries

 Venous Drainage 1.Venae cordis minimis 2.Anterior cardiac veins 3.Coronary sinus

 Venous Drainage

1 -venae cordis minimi : Are minute veins which lie in the muscle wall and open directly into any chamber 2- anterior cardiac veins : Series of small veins which runs transversely to open into the Rt atrium small vein running parallel to one another on ant wall of rt ventricle  Venous Drainage :

3- coronary sinus : It is a wide venous channel situated in the posterior part of coronary sulcus & ends in the Rt atrium

Tributaries of Coronary sinus: 1. Great Cardiac vein :  ascend with ant interventricular artery then curves with the circumflex artery to end in the coronary sinus 2. Middle cardiac vein :  accompany the posterior interventricular artery 18

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Oblique Vein of Lt Atrium (of Marshall) 20

1.Right atrioventricular groove:  Right coronary artery  Small cardiac vein 2. Left anterior atrioventricular groove:  Left coronary artery 3. Left posterior atrioventricular groove:  Coronary sinus 4. Anterior interventricular groove:  Anterior interventricular artery  Great cardiac vein

5. Posterior interventricular groove :  Posterior interventricular artery  Middle cardiac vein

Cardiac Veins (Sternocostal Surface) Anterior cardiac veins

Cardiac Veins (Diaphragmatic Surface)