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