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