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