Overview embryonic structures Heart development login to view 5 more bullets Embryonic structures Embryonic structure Adult structure Truncus Arteriosus Ascending aorta Pulmonary trunk Bulbus cordis Smooth part of left and right ventricle Primitive ventricle Trabeculated part of left and right ventricle Primitive atria Trabeculated part of left and right atrium Sinus venosus Coronary sinus Smooth part of right atrium Right common and right anterior cardinal vein SVC Truncus arteriosus login to view 3 more bullets Persistent truncus arteriosus login to view 1 more bullet Transposition of great vessels (transposition of great arteries) login to view 5 more bullets Tetralogy of Fallot login to view 6 more bullets Interventricular septum development Muscular ventricular septum login to view 3 more bullets Common ventricle login to view 1 more bullet Membranous septal defect login to view 6 more bullets Interatrial septum development Septum primum login to view 3 more bullets Septum secundum login to view 5 more bullets Patent foramen ovale login to view 1 more bullet Interatrial septum needs to be penetrated to allow for access to the left side of the heart during procedures