Examination shows that the heart of andrias davidianus have three chamers - two atria and one ventride , the atria on the left of midline , the ventricle on the right of midline , and the atria are divided into two cavities by septum interatriale . there are four valvula semilunaris in conus arteriosus , but no spiral valve in conus arteriosus . the coronary artery is made by arterica carotis externa branches 研究结果表明,中国大鲵循环系统解剖学特点为: 1 .心脏:心房心室为左右排列,两心房前后排列,共有4对动脉弓,其中第二、三对动脉弓汇合成一条背主动脉;动脉圆锥基部与心室相接处有4个瓣膜,动脉圆锥内没有螺旋瓣,动脉圆锥与腹侧主动脉干之间有3个半月瓣;房间隔有穿孔;冠状动脉由颈外动脉的分支汇合而成。