Relier Pairs Heart EmbryologyVersion en ligne Match the structure with what it gives rise to par Jimmy Jennings 1 left horn of sinus venosus 2 primitive atrium 3 right common cardinal vein and right anterior cardinal vein 4 primitive ventricle 5 truncus arteriosus 6 right horn of sinus venosus 7 bulbus cordis 8 primitive pulmonary vein 9 endocardial cushion superior vena cava smooth parts of lv and rv smooth left atrium ascending aorta/pulmonary trunk smooth part of right atrium trabeculated LV and RV atrioventricular node, semilunar valves, trabeculated part of LA and RA coronary sinus atrial septum, membranous interventricular septum