ANATOMY

Detailed explanation-1: -The outer layer of the heart wall is the epicardium. The epicardium refers to both the outer layer of the heart and the inner layer of the serous visceral pericardium, which is attached to the outer wall of the heart.

Detailed explanation-2: -The epicardium, the outer layer of the heart, forms by the growth of epithelial tissue from the dorsal mesothelium of the sinus venosus region. This single-cell layer spreads in a stereotyped pattern over the myocardium.

Detailed explanation-3: -The pericardium subdivides into two layers, a superficial fibrous layer, and deeper serous layer. The fibrous layer is composed of fibrous connective tissue.

Detailed explanation-4: -The epicardium, or the innermost layer of the pericardium, is the outermost layer of the heart itself. It is composed of mesothelial cells, fat, and connective tissue. It is adjacent to the myocardium, the middle muscular layer. The innermost layer is referred to as the endocardium.

Detailed explanation-5: -The endocardium is the innermost layer of the heart. It lines the inner surfaces of the heart chambers, including the heart valves.