PATHOLOGY

Detailed explanation-1: -[2] Coronary arteries and veins, lymphatic vessels, and nerves run below the epicardium. The endocardium is composed of the endothelium and the subendothelial connective tissue layer. The subendocardium is found between the endocardium and myocardium and contains the impulse-conducting system.

Detailed explanation-2: -Endocardium. The inner layer of the heart wall is the endocardium, composed of endothelial cells that provide a smooth, elastic, non-adherent surface for blood collection and pumping.

Detailed explanation-3: -The heart wall is comprised of three layers. The endocardium is the innermost layer, and the muscular middle layer is the myocardium. The epicardium is the outermost layer of the heart wall, and also the innermost layer of the protective pericardium that surround the heart.

Detailed explanation-4: -The pericardium is a thin-walled structure composed of two layers, a serous visceral layer (epicardium) and a fibrous parietal layer, both of which surround and protect the heart.