part of part of connects immediate transformation of embryonic structure cardiac atrium cardiac ventricle atrioventricular canal ependymal canal Wikipedia:Atrioventricular_canal UBERON:0002087 atrial canal ZFA:0001315 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 TAO:0001315 AVC EHDAA:764 SCTID:341079007 VHOG:0001473 FMA:71121 XAO:0004123 AV canal presumptive atrioventricular canal atrioventricular region