what are the layers of the heart and their functions
The myocardium is the middle muscular layer of the heart's walls and it functions by providing a scaffolding for the heart chambers, assisting in contraction and relaxation of the cardiac walls so that blood can pass between the chambers and electrostimulation conduction through its own tissues and into the epicardium.
The endocardium is the most inner layer of the heart. It forms the inner layer of all four heart chambers and is directly connected to all the inner cardiac appendages, such as the bicuspid valve, the tricuspid valve, the pulmonary valve, the aortic valve, the chordae tendineae and the papillary muscles.
Lesson Summary. The heart wall is composed of three main layers: the epicardium, myocardium, and endocardium. The pericardium (which is formed by the fibrous pericardium, the parietal pericardium and the epicardium) forms the outermost protective layer.
The epicardium is the layer of muscle found covering the external surfaces of the heart. It is directly fused with the myocardium internally and is in contact with the serous layer of the pericardium. It is sometimes considered as a division of the inner layer of the pericardium.