The aortic valve is located at the aortic root , where the left ventricle connects to the ascending aorta.

The aortic valve is one of the four main valves in the human heart, serving as the final "gatekeeper" that regulates blood flow from the left ventricle into the aorta . Its primary function is to ensure that oxygen-rich blood moves in a single direction—out to the rest of the body—while preventing any backflow into the heart. Anatomy and Structure

Each leaflet is composed of three distinct layers: the fibrosa (aortic side, primarily collagen), the spongiosa (middle layer, shock-absorbing), and the ventricularis (ventricular side, rich in elastin).

The valve operates based on pressure differentials between the heart and the body.

Directly behind each cusp are elliptical depressions in the aortic wall that house the openings ( ostia ) to the coronary arteries, ensuring the heart muscle receives its own blood supply during diastole. Function in the Cardiac Cycle

Aortic Valve: Function, Location & Anatomy - Cleveland Clinic