Caudal vena cava (CaVC) injection study in a normal rabbit. Note the retrograde flow into the right cranial vena cava (CrVC) which is relatively small because rabbits have two cranial venae cavae. Note the pulsatile retrograde flow into the coronary sinus (CS). Pulmonary trunk (PT). Left pulmonary artery (LPA). Right pulmonary artery (RPA).