Heart valves

Heart valves are valves that provide one-sided blood flow to the heart. They are not innervated and they are avascular (they open and close based on a pressure gradient). From a histological point of view, these are duplicatures of endocardium. They are formed by an internal fibrous plate (collagen and elastic fibers), on the surface they are covered with endothelium. They are connected to the fibrous rings of the heart skeleton. In the heart we find 4 heart valves, they are:
 * 1) tricuspid valve(valva atrioventricularis dextra seu tricuspidalis) - between the right atrium and the right ventricle;
 * 2) pulmonary valve (valva trunci pulmonalis) - between the right ventricle and the pulmonary artery;
 * 3) mitral valve (valva atrioventricularis sinistra seu bicuspidalis seu mitralis) - between left atrium and left ventricle;
 * 4) aortic valve (valva aortae) - between the left ventricle and the aorta.

Related links

 * Heart
 * Heart/histology
 * Heart valves diseases

External sources

 * Chlopeň (česká wikipedie)