The heart receives its blood supply from two main coronary arteries - the right and left coronary arteries. The right coronary artery supplies the right atrium and ventricle while the left coronary artery supplies the left atrium and ventricle. The venous drainage of the heart occurs through the coronary sinus, anterior cardiac veins, and minute heart veins which all drain deoxygenated blood back into the right atrium.

1. BLOOD SUPPLY
OF HEART

2. CONTENTS
Heart
Arterial supply
Venous drainage

3. HEART
• The heart is a conical hollow muscular
organ situated in the middle mediastinum .
• It is enclosed within the pericardium.
• It is placed obliquely behind the body of
sternum and adjoining parts of
• costal cartilages.

4. FEATURES OF HEART
The human heart has four
chambers:

5. ARTERIAL SUPPLY OF HEART
The heart is supplied by TWO arteries
Left coronary is larger in calibre and
supplies more myocardium.
LEFT CORONARY
ARTERY
RIGHT CORONARY
ARTERY

6. Right Coronary Artery
It arises from the anterior aortic
sinus of ascending aorta.

7. COURSE OF RIGHT
CORONARY ARTERY

8. BETWEEN PULMONARY TRUNK
AND RT. AURICLE
PASSES FORWARD
MOVES
DOWNWARDS
ATRIO-VENTRICULAR GROOVE
WINDS
AROUND
INFERIOR BORDER
PASSES UPWARDS ALONG
ATRIO-VENTRICULAR GROOV
CRUX OF THE HEART
TERMINATES
ANASTOMOSING WITH CIRCUMFLEX BRANCH
OF LEFT. CORONARY ARTERY

9. CRUX OF THE HEART
It is the meeting point of interatrial,posterior interventricular and
posterior part of atrioventricular groove.

10. BRANCHES FROM ANTERIOR
SEGMENT
 Ventricular rami
 Atrial Rami
• Right conus artery
• Right anterior ventricular rami
BRANCHES FROM POSTERIOR
SEGMENT
 RIGHT POSTERIOR VENTRICULAR RAMI
 POSTERIOR INTRANVENTRICULAR BRANCH
 RIGHT POSTERIOR ATERIAL RAMI
 ARISE FROM CRUX OF HEART AS A SINGLE A
BRANCH IN 70% CASES

11. LEFT CORONARY ARTERY
Left coronary artery is wider than right
coronary artery.
It arises from left posterior aortic sinus
of ascending aorta.

12. COURSE OF LEFT
CORONARY ARTERY

13. PASSES BEHIND THE
PULMONARY TRUNK
GOES ON BETWEEN
PULMONARY TRUNK AND LEFT
AURICLE
DIVIDES INTO 2 BRANCHES
ANTERIOR
INTERVENTRICULAR
CIRCUMFLEX
DESCENDS ALONG STERNO-
COSTAL SURFACE
WINDS AROUND
INCISURA APICIS
CORDIS END
PASSES ALONG THE
LEFT OF AV GROOV
WINDS AROUND
LEFT BORDER
POSTERIOR PART
OF AV GROOVE
ANATOMOSING WITH
RIGHT CORONARY ARTERY

14. BRANCHES
 ANTERIOR INTERVENTRICULAR ARTERY
CIRCUMFLEX ARTERY
• Anterior ventricular rami
 one of the right anterior ventricular rami forms the left
conus artery which supplies the infundibulum of right
ventricle.
• Septal rami
• Atrial and ventricular rami
• Sinu-atrial nodal artery (35% subjects arises from
circumflex branch)
• Left marginal artery
• Posterior interventricular artery
 It extends as a continuation of circumflex branch
in 10% to 20% individuals.
• An atrial branch of circumflex artery

15. CORONARY DISTRIBUTION
 Right coronary artery supplies whole of
right atrium, most of the right ventricle
except a strip along the anterior
interventricular groove.
 Left coronary artery supplies most of the
left atrium and left ventricle except a
strip along the posterior and inferior
surfaces of the heart.

16. Coronary Artery Dominance
The artery that gives the posterior
interventricular artery determines the
coronary dominance.
RCA (Right coronary artery)
CX(Circumflex artery)

17. VENOUS DRAINAGE
 The venous drainage of the heart is by 3 ways
1.Coronary sinus
2.Anterior Cardiac Veins
3.Venae Cordis Minimae

18. CORONARY SINUS
It is the largest vein of the heart situates
in the left posterior coronary sulcus.It is
about 3cm. long and ends by opening
into the posterior wall of the right atrium.

19. Branches
 1.Great cardiac vein-it enter the left end of the
coronary sinus.
 2.Middle cardiac veins-it accompanies the posterior
interventricular artery and joins the right end of the coronary
sinus.
 3.Small cardiac veins-it accompanies the right coronary srtery
and joins the right end of the coronary sinus.
 4.Posterior veins of left ventricle-it runs on the diaphragmatic
surface of the left ventricle and ends in the coronary sinus.
 5.Oblique vein of the left atrium-it runs on the posterior
surface of the left atrium,joins the left end of coronary sinus
and develops from the left common cardinal veins.
 6.The right marginal veins-it accompanies the marginal
branch of the right coronary artery.

20. ANTERIOR CARDIAC VEINS
The anterior cardiac veins are three
or four small veins run on the
anterior wall of the right
ventricle,open directly into the
right atrium.

21. VENAE CORDIS MINIMAE
Numerous small veins present in
all four chambers of the heart
which opens directly into the
cavities.