The aortic valve is a semi-lunar valve situated at the root of the aorta receiving oxygenated blood from the left ventricle to be pumped to the rest of the body (see figures 104, 104-1, 106b). It has fibrous cusps attached to the aortic root, circling the inside of the vessel root (see figures 25, 104a, 104c). The small space between the attachment of each cusp is called a commissure.