鸡胚半月瓣Valsalva窦的形态发生

MORPHOGENESIS OF VALSALVA'S SINUS OF SEMILUNAR VALVES IN CHICK EMBRYO

用光镜和扫描电镜方法,观察鸡胚半月瓣Valsalva窦的形态发生过程。按鸡胚发育的H-H分期法,窦发生开始于第30期,至第34期已基本形成。在形成过程中,瓣膜心室面和动脉面的内皮细胞有明显差异;瓣膜内的间充质在不同的部位疏密分布不均,与内皮细胞的形态有对应关系。本研究表明,Valsalva窦的形成,不仅与瓣膜动脉面的内皮细胞向深部的间充质生长有关,而且与间充质疏松并形成一些腔隙有密切联系。

The morphogenesis of Valsalva's sinus of semilunar valves in chick embryo was studied with SEM and LM. The sinus began to develop at stage 30 and was basically formed at stage 34 (based on H-H staging). The endothelial cells on arterial and ventricular surfaces of the valve were morphologically different. Mesenchymal cells beneath the endothelium were distributed loosely or densely on different parts of the valve in accordance with the morphological changes of the endothelial cells. The study suggests that the formation of the sinus is associated with not only the growth of endothelial cells on the arterial surface of the valve into underneath mesenchyme, but also with the mesenchyme which is loosing and presents some cavities.