Pulmonary valve
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The pulmonary valve ( Valva trunci pulmonalis ) is one of the four heart valves . It is located in the pulmonary trunk , directly at its origin in the right ventricle, and prevents the blood from flowing back at the beginning of the heart's relaxation phase ( diastole ).
As a so-called pocket valve, the pulmonary valve consists of three crescent-shaped pockets ( valvulae ), the formations of the intima , the innermost layer of the blood vessels , are:
- Valvula semilunaris dextra (right crescent-shaped pocket)
- Valvula semilunaris sinistra (left crescent-shaped pocket)
- Valvula semilunaris anterior (anterior crescent-shaped pocket, known in animal anatomy as Valvula semilunaris intermedia (middle crescent-shaped pocket))
In humans, the pulmonary valve forms together with the aortic valve in the 5th to 7th week of embryonic development .
If the valve no longer closes tightly, one speaks of pulmonary valve insufficiency . Insufficient opening is called pulmonary stenosis . Both functional disorders require the heart to work harder to pump and lead to an overload of the heart muscle.
literature
- Uwe Gille: Cardiovascular and immune system, Angiologia. In: Franz-Viktor Salomon, Hans Geyer, Uwe Gille (Ed.): Anatomy for veterinary medicine. 2nd, revised and expanded edition. Enke, Stuttgart 2008, ISBN 978-3-8304-1075-1 , pp. 404-463.