Heart Valves Top View with Frontal View Inset - stock illustration

A top view of the heart with the atria, aorta and pulmonary trunk removed to reveal the four heart valves. The four heart valves are the two atrioventricular (AV) valves, the mitral valve (bicuspid valve), and the tricuspid valve, which are between the upper atria and the lower ventricles. The two semilunar (SL) valves, the aortic valve and the pulmonary valve, which are in the arteries leaving the heart. A frontal view inset shows the relative placement of the heart valves.