The pulmonary valve ( valva pulmonary trunk ) is one of the four heart valves. It is located in the pulmonary trunk, right on the origin of the right ventricle and prevents backflow of blood at the beginning of the relaxation phase (diastole ) of the heart.
The pulmonary valve is than so-called pocket flap of three crescent- shaped pockets ( valvulae ), which are developments of the intima, the innermost layer of blood vessels:
- Valvula semilunaris artery (right half-moon shaped pocket )
- Valvula semilunaris sinistra (left crescent- shaped pocket )
- Valvula semilunaris anterior ( front half-moon shaped bag, in animal anatomy as valvula semilunaris intermedia (mean half-moon shaped pocket ) refers )
The pulmonary valve forms in humans, together with the aortic valve in the 5th to 7th week of embryonic development.
Close the flap no longer sealed, it is called a pulmonary valve. An insufficient opening is referred to as pulmonary stenosis. Both disorders require increased pumping work of the heart and lead to an overload of the heart muscle.