Atrioventricular valves development in human heart: the Paris embryological collection revisited.
29 human embryos staging from stage 15 to stage 23 (post-somitic period, collection of the UER Biomedicale des Saints-Péres, Université René Descartes Paris V) have been studied. The most important morphological events of the atrioventricular valves development have been reinvestigated and photographed. This is a complementary information about cardiac development analysing this french collection of human embryos (Mandarim-de-Lacerda, in press). At stage 15, we can observe the gelatinous reticulum well organized when cardiac valves will become established; progressively the fused endocardial cushions and right and left lateral cushions encircle the atrioventricular channels indicating the site of the tricuspid valves. These cushions, however, have a temporary influence being replaced gradually by atrial and ventricular myocardium. At stage 23, the heart presents a complete atrioventricular valvular structure.
Mandarim-de-Lacerda
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CA
Department of Anatomy, State University of Rio de Janeiro (UERJ), Brazil.
D006801:Humans; D008943:Mitral Valve / Q000196:embryology*; D010210:Papillary Muscles / Q000196:embryology; D014261:Tricuspid Valve / Q000196:embryology*