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defined Semilunar valves

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When formation of the aorticopulmonary septum has been com­pleted, the semilunar valves begin to develop at the orifices of the aorta and pulmonary trunk. The primordium of each semilunar valve appears as three swellings of endocardial tissue at the orifices of both the aorta and pulmo­nary trunk. The swellings become hol­lowed out on their upper surfaces to form three thin-walled cusps of the se­milunar valve. In addition to the local tissue, the neural crest cells also con­tribute to the formation of the semilunar valves.
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