Download OVER VIEW OF CORONARY ARTERIES

OVER VIEW OF CORONARY ARTERIES
LEARNING OBJECTIVES
At the end of lecture the student will be able to:
• Discuss the main branches of coronary arteries.
• Enlist the branches of each main artery.
• Give the ansthamosis of coronaries.
ARTERIAL SUPPLY OF HEART
• Coronary arteries are the first branches of aorta--- supply the
myocardium and epicardium.
• The blood vessels of heart normally embedded in fats across the heart
just deep to the epicardium.
• The right and left coronary artery arises from the corresponding aortic
sinuses at the proximal part of ascending aorta superior to the aortic
valves ---pass around opposite side of pulmonary trunk.
• Coronary arteries supply both atria and ventricles.
CORONARY ARTERIES
• Right coronary artery: arises from the right aortic sinus of ascending
aorta --- passes right side of pulmonary trunk in the coronary sulcus:
• Branches:
• Sinuatrial nodal branch.
• Right marginal branch.
• Artioventricular nodal branch.
• Posterior interventricular branch.
• Interventricular septal branch.
Sinuartial nodal branch: supplies the SA node.
Right marginal branch : which supplies the right border of
heart –toward the apex.
Atrioventricular nodal branch: supplies the AV node.
Posterior interventricular branch: this branch supplies the
adjacent areas of both ventricles and sends perforating branch to
interventicular septum : interventicular septal branch
Typically right coronary supplies:
Right atrium.
Right ventricle.
Part of left ventricle.
Part of IV septum—posterior 3rd.
SA node ( 60% ).
AV node (80%).
LEFT CORONARY ARTERY
Left coronary artery : arises from the left aortic sinus of the ascending aorta–
passes left auricle and left side of pulmonary trunk---runs in the coronary
sulcus.
• Branches:
• SA nodal branch.
• Left anterior descending artery.
• Circumflex branch.
• Left marginal branch
• SA nodal Branch: in 40% of the people it arises from the
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circumflex branch of left coronary artery – supplies the SA node.
LCA divides into 2 branches anterior IV branch (left anterior
descending) and circumflex branch.
Anterior interventricular branch: passes along the IV groove to
the apex anastomoses with posterior IV branch of right
coronary– lateral branch.
Circumflex branch---left posterior border of heart to the posterior
surface of heart.
Left marginal branch—left margin of heart supplies the left
ventricle.
LEFT CORONARY ARTERY
Left coronary supplies:
Left atrium.
Most of left ventricle.
Part of right ventricle.
Most of IV septum.
SA node in (40%)
On the left an overview of the coronary arteries in the anterior
projection.
Left Main or left coronary artery (LCA)
–Left anterior descending (LAD)
•diagonal branches
•septal branches
–Circumflex (Cx)
•Marginal branches (M1,M2)
Right coronary artery
–Acute marginal branch (AM)
–AV node branch
–Posterior descending artery (PDA)
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INICAL ORIENTED ANATOMY BY K.L.M
6TH EDITION