Tricuspid valve
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The tricuspid valve ( valva atrioventricularis dextra , right AV valve) is the heart valve between the right atrium and the right ventricle . It is a leaflet valve and in mammals usually consists of three ( tri ) sails ( Latin cuspis , tip, tip ' ):
- Cuspis angularis (cranio-medial)
- Cuspis parietalis (lateral)
- Cuspis septalis (caudal).
These three cusps are connected to the three papillary muscles of the right ventricle by tendon threads ( Chordae tendineae ) .
The tricuspid valve acts as a check valve. It opens when the right ventricle of the heart relaxes ( diastole ). During systole , the valve closes due to the increasing pressure and prevents the blood from flowing back into the right atrium. The system of tendon threads and papillary muscles prevents the cusps from penetrating into the right atrium during systole.
Failure to close the valve is known as tricuspid regurgitation . The narrowing of the opening of the tricuspid valve is called tricuspid stenosis or tricuspid stenosis for short. The hereditary lack of the valve is called tricuspid atresia . Another congenital malformation is the Ebstein anomaly .
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.