QS Study

Aortic sinus

At the root of the aorta above each cusp of the aortic valve, there is a slight dilatation of the vessel wall called the aortic sinus. It is one of the anatomic dilations of the ascending aorta, which occurs just above the aortic valve.

There are three sinuses:

  1. Anterior aortic sinus. It gives rise to the right coronary artery.
  2. Left posterior aortic sinus. It gives rise to the left coronary artery.
  3. Right posterior aortic sinus. Usually, no vessels arise from the right posterior aortic sinus.

Fig: Aortic Sinus

Functions

Right coronary artery arises from the anterior aortic sinus & left coronary artery arises from the left posterior aortic sinus. Functionally, the sinuses are important in maintaining the normal flow of blood into the coronary ostia and also the unblocked state of the valve leaflets during systole.

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