Semilunar valve
The semilunar valves in aortic (shown here) and pulmonary trunks consist of three, cup-shaped leaflets. Semilunar valves resemble atrioventricular valves with a central, dense connective tissue core covered on both surfaces by an endothelium. Each valve inserts into an annulus fibrosus. The atrial wall is much thinner than is the more muscular ventricular wall. 40x
Aortic valve leaflet
The semilunar valves in aortic (shown here) and pulmonary trunks consist of three, cup-shaped leaflets. Semilunar valves resemble atrioventricular valves with a central, dense connective tissue core covered on both surfaces by an endothelium. Each valve inserts into an annulus fibrosus. The atrial wall is much thinner than is the more muscular ventricular wall. 40x
Aortic wall
The semilunar valves in aortic (shown here) and pulmonary trunks consist of three, cup-shaped leaflets. Semilunar valves resemble atrioventricular valves with a central, dense connective tissue core covered on both surfaces by an endothelium. Each valve inserts into an annulus fibrosus. The atrial wall is much thinner than is the more muscular ventricular wall. 40x
Membranous septum
The semilunar valves in aortic (shown here) and pulmonary trunks consist of three, cup-shaped leaflets. Semilunar valves resemble atrioventricular valves with a central, dense connective tissue core covered on both surfaces by an endothelium. Each valve inserts into an annulus fibrosus. The atrial wall is much thinner than is the more muscular ventricular wall. 40x
Atrial wall
The semilunar valves in aortic (shown here) and pulmonary trunks consist of three, cup-shaped leaflets. Semilunar valves resemble atrioventricular valves with a central, dense connective tissue core covered on both surfaces by an endothelium. Each valve inserts into an annulus fibrosus. The atrial wall is much thinner than is the more muscular ventricular wall. 40x
Annulus fibrosus
The semilunar valves in aortic (shown here) and pulmonary trunks consist of three, cup-shaped leaflets. Semilunar valves resemble atrioventricular valves with a central, dense connective tissue core covered on both surfaces by an endothelium. Each valve inserts into an annulus fibrosus. The atrial wall is much thinner than is the more muscular ventricular wall. 40x
Area shown in next image
The semilunar valves in aortic (shown here) and pulmonary trunks consist of three, cup-shaped leaflets. Semilunar valves resemble atrioventricular valves with a central, dense connective tissue core covered on both surfaces by an endothelium. Each valve inserts into an annulus fibrosus. The atrial wall is much thinner than is the more muscular ventricular wall. 40x
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