Copy Rig University Cardiac venous system 1-Great cardiac vein 2-Middle cardiac vein 3-Small cardiac vein Coronary sinus 3 Right atrium 2 Copy Right- Hongqi ZHANG-Department of Anatomy-Fudan UniversityCopy Right- Hongqi ZHANG-Department of Anatomy-Fudan University Copy Right- Hongqi ZHANG-Department of Anatomy-Fudan University Cardiac venous system 1-Great cardiac vein 2-Middle cardiac vein 3-Small cardiac vein Coronary sinus Right atrium 1 2 3