part of part of connects connects develops from develops from immediate transformation of embryonic structure cardiac atrium cardiac ventricle atrioventricular canal http://upload.wikimedia.org/wikipedia/commons/d/d8/Gray464.png ependymal canal Wikipedia:Atrioventricular_canal UBERON:0002087 atrial canal ZFA:0001315 The canal connecting the primitive atrium and ventricle in fishes and amniotes embryo. [TFD][VHOG] canalis atrioventricularis The part of the heart connecting the atrium to the cardiac ventricle[ZFA]. In the developing heart, the constriction between the atrium and ventricle constitutes the atrial canal, and indicates the site of the future atrioventricular valves[WP]. atrio-ventricular canal EMAPA:16546 The right side of the AVC becomes the tricuspid valve whereas the left side of the AVC will become the bicuspid valve In the embryo, the atrioventricular canal delays the impulse from atrium to ventricle[PMID:22984480] TAO:0001315 AVC EHDAA:764 SCTID:341079007 The heart is the first organ to form and function in a vertebrate. (...) Septation of the AV canal is initiated with the formation of inferior and superior endocardial cushions in response to signaling from the overlying myocardium. (...) Analysis of zebrafish mutants with cardiovascular defects uncovered a previously unexpected level of conservation between zebrafish and human cardiovascular physiology.[uncertain][VHOG] VHOG:0001473 FMA:71121 XAO:0004123 this is a lumen in EHDAA2 AV canal heart tube presumptive atrioventricular canal atrioventricular region Melissa Haendel Christopher J. Mungall