Where is the coronary ostia located?

The coronary ostia are located at the base of the aorta, specifically within the aortic sinus, which is situated just above the aortic valve. They are the openings through which the right and left coronary arteries emerge from the aorta, supplying blood to the heart muscle. There are typically two main ostia: one for the right coronary artery and one for the left coronary artery.