Atrioventricular Valves

The atrioventricular valves are formed upon proliferation of the cushion mesenchyme, leading to closure of the atrioventriclar septum and creation of valve leaflets. Remodeling and maturation of the valve primordium is accompanied by decreased proliferation of cushion mesenchyme. By the end of the process, the atrioventricular valves in the left and right canals are sculpted to form the mitral valve (bicupsid) which lies between the left atrium and the left ventricle, as well as the tricuspid valve which lies between the right atrium and the right ventricle.