Structure of Heart Anatomy

Heart is formed by heart muscle and connective tissues. The organ has three layers. Epicardium, myocardium, and endocardium. Epicardium (the outer layer) is composed of connective tissues. Myocardium (in the middle of epicardium andendocardium) has function to control the rate of heart pulse. Endocardium (the iner layer) is composed of a layer of endothelium tissue. 

Within the heart, there is a partition (septum) that separates the right side and left side of the heart. The iner part of heart comprises of two atriums and two ventricles. The atrium is a chamber that receives blood from vein. While, ventricles is responsible for pumping blood out of the heart. Heart is equiped by a valve (valvula) to maintain the direction of the flow of the blood. There are three types of heart valve, three leaflet valves (tricuspid/atrioventricular valve), two leaflets valves (bicuspid) and semilunar valves. 

Heart’s function is controlled by involuntary nerve systems. The nerve nodes that can be found in the heart are as follows. 

· Sinoatrial node (Keith-Flack) is located in the right atrium and branches to form Weinchebah nerves. 

· Atrioventricularis node (Tawara) is located in the partition between the atrium. 

· His bundle node is located in the partition between ventricles and branches into Purkinje fiber.