posterior view heart anatomy medical

presentation advertising document cartoon diagram drawing poster sketch circle person brand organ font text line nose face hand left atrium pulmonary veins right superior vena cava inferior posterior interventricular sulcus coronary sinus arteries apex heart artery circumflex great cardiac vein middle ventricle interatrial septum base anterior surface diaphragmatic aorta tricuspid valve mitral aortic sinoatrial node atrioventricular bundle bundle purkinje fibers heart layers function epicardium myocardium endocardium