2surfacesSternocostal/anterior surface:RA,RV+LV,leftauricle?Diaphragmatic/inferiorsurface:LV+RVAscendingaortaPulimonarytrunkLeftauricle
• Sternocostal / anterior surface: RA, RV + LV, left auricle • Diaphragmatic / inferior surface: LV + RV 2 surfaces Left auricle Ascending aorta Pulmonary trunk
3bordersRightborder:RA(verticalLeftborder:LVCroundedInferiorborderRV+LhorizontalLeftvenfricleRighitauricle
• Right border: RA（vertical） • Left border: LV（rounded） • Inferior border: RV + LV （horizontal） 3 borders Right auricle Left ventricle