What is the term for the slight bulge at the base of the aortic leaflet?

The term for the slight bulge at the base of the aortic leaflet is the Sinus of Valsalva. This structure is critical in understanding the anatomy of the heart, particularly the aortic valve. The Sinus of Valsalva refers to the three anatomic dilations found just above the aortic valve, which correspond to the areas where the aortic leaflets are anchored. These sinuses help to prevent the leaflets from sticking to the wall of the aorta during diastole, allowing them to close properly and ensure effective sealing of the valve.

The aortic root encompasses the initial portion of the ascending aorta and includes the region of the Sinus of Valsalva, but it is a broader term and not specific to the bulge itself. The coronary sinus is part of the venous drainage system of the heart, collecting blood from the cardiac veins. The interventricular septum refers to the wall separating the left and right ventricles. Understanding these anatomical structures helps emphasize the importance of the Sinus of Valsalva in the mechanics of heart function and the proper functioning of the aortic valve.