Semilunar Flap (Pocket Flaps)

Semilunar valves or pocket valves are heart valves between left ventricle and aorta (aortic valve), and between right ventricle and large pulmonary artery (pulmonary valve).

https://de.wikipedia.org/wiki/Taschenklappe_(Heart) _{(Wikipedia CC-by-sa-3.0)}