| |
|
| The blood
supply of the heart |
Supplied by the left and
right coronary arteries which originate From the left and right coronary sinuses of the aorta
respectively. |
|
|
|
| |
|
|
| Branches and
distribution |
Artery |
Branches |
Distribution |
| Right coronary
artery |
- Posterior interventricular
- Marginal
- AV modal artery
|
- Right atrium
- Right ventricle
- AV node and bundle
- SA node
- Variable amount of left atrium and ventricle
|
|
| Left
coronary artery |
- Anterior interventricular
- Circumflex
|
- Both ventricles, and the interventricular
septum.
- Left atrium
- Sino Atrial node
|
|
|
| Variations in coronary
arteries: |
- In about 50% the cases, the right coronary artery
is dominant i.e. it crosses to the left side, and supplies the left
ventricle, and the interventricular septum.
- In about 20% of cases, the left coronary artery is
dominant. In addition to supplying the left ventricle, and the interventricular
septum, it sends branches to the
right ventricular wall.
- In about 30% of the cases, the coronary arterial
pattern is balanced. There may be only one coronary artery.
- In about 4% of hearts, there are accessory
coronary arteries
- A 3rd coronary artery may be present in upto 35% of individuals
There is thus, no sharp line of demarcation between
the ventricular distribution of the coronary arteries. |
| |
|
| Extracardiac Anastomosis
|
- The anastomosis between the coronary arteries
and extra-cardiac vessels exist e.g.
pericardial
arteries,
internal thoracic
superior phrenic
bronchial
|
| |
|
