powerpoint files of Thorax

Heart

Dr.Muna Zuhair
Lec. 3

Atrial (interatrial) septum.

Structure of the heart

Ventricular (interventricular) septum.

Skeleton of the heart.

Conducting system of the heart

Sinoatrial node.

Atrioventricular node.

Atrioventricular bundle.

Purkinje fibers.

Sinoatrial node

Atrioventricular node

Atrioventricular bundle

Arterial supply of the heart

Right coronary a.

Branches

• Right conus a.
• Anterior ventricular branches.
• Posterior ventricular branches.
• Posterior interventricular (descending) a.
• Atrial branches.

Branches

Right conus a.

Anterior ventricular branches.

Marginal branch.

Posterior ventricular branches.

Posterior interventricular (descending) a.

A branch to atrioventricular node.

Atrial branches.

Artery of the sinoatrial node.

Left coronary a.

Branches

• Anterior interventricular (descending) branch.
• Circumflex a.

Branches

Anterior interventricular (descending) branch.

Left diagonal a.

Left conus a.

Circumflex a.

Left marginal a.

Anterior ventricular and posterior ventricular branches.

Atrial branches.

Variations in the coronary arteries

Right dominance.

Left dominance.

Coronary a. anastomoses

They are not large enough to provide adequate blood supply to cardiac m. if one of large branches blocked by disease.

Summary of overall arterial supply to the heart in most individuals

Right coronary a.

Left coronary a.

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