What are the main histological layers of the right atrium?
The right atrium, like other chambers of the heart, is composed of three main layers: the endocardium, the myocardium, and the epicardium.
Endocardium: This is the innermost layer, consisting of endothelial cells that line the heart chambers. It is supported by a thin layer of connective tissue. Myocardium: This is the thick, muscular middle layer made up of cardiac muscle cells (cardiomyocytes). It is responsible for the contractile function of the heart. Epicardium: This outer layer is also known as the visceral layer of the serous pericardium. It includes connective tissue and a layer of mesothelial cells.
