The coronary circulation supplies blood to and provides drainage from the tissues of the heart. The main arteries are the right and left coronary arteries. The right coronary artery supplies the right atrium and ventricle. The left coronary artery divides into the anterior interventricular artery and circumflex artery. The main veins that drain the heart include the coronary sinus, great cardiac vein, middle cardiac vein, small cardiac vein, and left marginal vein. They drain into the right atrium via the coronary sinus.

1. The
Objective
10 – 15 min 10 Slides Feb 25, 2018
He a r t
Blood supply of the

2. What’s the coronary circulation?
The
10 – 15 min 10 Slides Feb 25, 2018
Objective
Outline
The blood supply of the heart.

3. What’s the coronary circulation?
Introduction

4. Part of the systemic circulatory system that supplies blood to
and provides drainage from the tissues of the heart.
What’s the coronary circulation?
Introduction

5. Arteries

6. Size:
Smaller than left coronary artery.
Origin:
from anterior aortic sinus of the
ascending aorta.
Course:
Exits between the right auricle and
pulmonary trunk.
Descends in the coronary sulcus to
reach the lower border
Turns backwards to anastomose with
circumflex branch of left coronary
artery.
Right coronary artery
Arteries

7. Post. interventricular artery
Runs with the middle cardiac vein
end by anastomosing with the Ant.
interventricular artery.
Supplying Both ventricles and
Posterior ⅓ of I.V septum
Arteries
Size:
Smaller than left coronary artery.
Origin:
from anterior aortic sinus of the
ascending aorta.
Course:
Exits between the right auricle and
pulmonary trunk.
Descends in the coronary sulcus to
reach the lower border
Turns backwards to anastomose with
circumflex branch of left coronary
artery.
Right coronary artery

8. Post. interventricular artery
Runs with the middle cardiac vein
end by anastomosing with the Ant.
interventricular artery.
Supplying Both ventricles and
Posterior ⅓ of I.V septum
Right marginal artery
Runs along lower border with the
small cardiac vein
Supplying Rt. ventricle.
Arteries

9. Post. interventricular artery
Runs with the middle cardiac vein
end by anastomosing with the Ant.
interventricular artery.
Supplying Both ventricles and
Posterior ⅓ of I.V septum
Right marginal artery
Runs along lower border with the
small cardiac vein
Supplying Rt. ventricle.
Rt. atrial and Rt. ventricular branches.
Nodal branches.
Right conus artery.
Small branches
Arteries

10. Size:
Larger than right coronary artery.
Origin:
from posterior aortic sinus of the
ascending aorta.
Course:
Exits between the left auricle and
pulmonary trunk.
Reaches the upper end of the
interventricular sulcus where it ends
by giving two branches.
Left coronary artery Post. interventricular artery
Runs with the middle cardiac vein
end by anastomosing with the Ant.
interventricular artery.
Supplying Both ventricles and
Posterior ⅓ of I.V septum
Right marginal artery
Runs along lower border with the
small cardiac vein
Supplying Rt. ventricle.
Rt. atrial and Rt. ventricular branches.
Nodal branches.
Right conus artery.
Small branches
Arteries

11. Ant. interventricular artery
Runs with great cardiac vein and
turns backwards to end by
anastomosis with PIA.
Supplying both ventricles.
and anterior ⅔ of I.V septum.
Size:
Larger than right coronary artery.
Origin:
from posterior aortic sinus of the
ascending aorta.
Course:
Exits between the left auricle and
pulmonary trunk.
Reaches the upper end of the
interventricular sulcus where it ends
by giving two branches.
Left coronary artery
Arteries

12. Circumflex artery
turns around left border with the
great cardiac vein
ends by anastomosis with RCA.
Branches:
Left marginal artery
Left atrial & Left ventricular branches
Nodal branches.
Ant. interventricular artery
Runs with great cardiac vein and
turns backwards to end by
anastomosis with PIA.
Supplying both ventricles.
and anterior ⅔ of I.V septum.
Arteries

13. Arteries

14. Veins

15. Coronary Sinus
Site: post. part of the coronary sulcus.
End: into right atrium
Veins

16. Coronary Sinus
Site: post. part of the coronary sulcus.
End: into right atrium
Begins: on the anterior surface of the
heart near the apex.
Course: runs with the anterior
interventricular artery turns to the left
with the circumflex artery in the
coronary sulcus.
End: join the left end of the coronary
sinus.
Great cardiac vein
Veins

17. Left marginal vein
Ascends along the left margin of the
heart and ends by joining the great
cardiac vein
Coronary Sinus
Site: post. part of the coronary sulcus
End: into right atrium
Begins: on the anterior surface of the
heart near the apex.
Course: runs with the anterior
interventricular artery turns to the left
with the circumflex artery in the
coronary sulcus.
End: join the left end of the coronary
sinus.
Great cardiac vein
Veins

18. Veins
Left marginal vein
Ascends along the left margin of the
heart and ends by joining the great
cardiac vein
Oblique vein
Begins: on the posterior surface of the
left atrium.
End: join the left end of the coronary
sinus.

19. Veins
Oblique vein
Begins: on the posterior surface of the
left atrium.
End: join the left end of the coronary
sinus.
Left marginal vein
Ascends along the left margin of the
heart and ends by joining the great
cardiac vein
Left posterior ventricular vein
runs on the diaphragmatic surface of
the left ventricle to the coronary sinus

20. Oblique vein
Begins: on the posterior surface of the
left atrium.
End: join the left end of the coronary
sinus.
Left marginal vein
Ascends along the left margin of the
heart and ends by joining the great
cardiac vein
Left posterior ventricular vein
runs on the diaphragmatic surface of
the left ventricle to the coronary sinus
Veins
Middle cardiac vein
Begins: on the inferior surface of the
heart near the apex.
Course: runs with the posterior
interventricular artery.
End: join the middle of the coronary
sinus. It may join the great cardiac vein.

21. Veins
Small cardiac vein
Begins: on the anterior surface.
Course: runs with the right marginal
artery
End: join the right end of the coronary
sinus.
Middle cardiac vein
Begins: on the inferior surface of the
heart near the apex.
Course: runs with the posterior
interventricular artery.
End: join the middle of the coronary
sinus. It may join the great cardiac vein.

22. Anterior cardiac veins
Small cardiac vein
Begins: on the anterior surface.
Course: runs with the right marginal
artery
End: join the right end of the coronary
sinus.
Middle cardiac vein
Begins: on the inferior surface of the
heart near the apex.
Course: runs with the posterior
interventricular artery.
End: join the middle of the coronary
sinus. It may join the great cardiac vein.
Veins
Veins drain the anterior wall of the
right ventricle.
Drain into right atrium.

23. Venae cordis minimi
Small veins in the walls of each one of
the chambers.
Drain into cavity of that chamber.
Veins
Anterior cardiac veins
Veins drain the anterior wall of the
right ventricle.
Drain into right atrium.

25. Coronary Sinus
Great cardiac vein
Small cardiac vein
Middle cardiac vein
Oblique vein
Left marginal vein
Left posterior ventricular vein
Venae cordis minimi
Anterior cardiac veins
Right coronary artery
Post. interventricular artery
Nodal branches.
Right marginal artery
Right conus artery.
Left coronary artery
Ant. interventricular artery
Left marginal artery
Circumflex artery

26. Advisor >
Dr. Elzainy
Websites >Gray’s Student 2nd > QuMed >
• Blood Supply of Heart.