Valve, mitral
One of the four valves of the heart, the mitral valve is situated between the left atrium and the left ventricle.
It permits blood to flow one way: from the left atrium into the left ventricle.
The mitral valve has two flaps (cusps) and so is called 'mitral' because it looks like a bishop's miter or headdress.
Also known as the bicuspid valve.