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 truncus arteriosus 4 bulbus cordis 5 right common cardinal vein and right anterior cardinal vein 6 primitive ventricle 7 endocardial cushion 8 primitive pulmonary vein 9 right horn of sinus venosus smooth parts of lv and rv trabeculated LV and RV smooth left atrium superior vena cava smooth part of right atrium atrioventricular node, semilunar valves, trabeculated part of LA and RA atrial septum, membranous interventricular septum ascending aorta/pulmonary trunk coronary sinus