The mitral valve is one of the four valves in the human heart that controls the flow of blood. It is also known as the bicuspid valve because it has two leaflets or cusps. Other synonyms for the mitral valve include the left atrioventricular valve, the mitral apparatus, and the mitral annulus. The valve is crucial for maintaining the proper blood circulation, and any issues in its function can lead to various heart problems such as mitral valve prolapse or mitral stenosis. Cardiologists and heart surgeons often use these terms interchangeably when discussing issues related to the mitral valve.