THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -The endocardium is the innermost layer of the heart and lines the chambers and extends over projecting structures such as the valves, chordae tendineae, and papillary muscles.

Detailed explanation-2: -The outer layer of the heart wall is the epicardium, the middle layer is the myocardium, and the inner layer is the endocardium.

Detailed explanation-3: -The coronary vessel structures are composed of an inner single layer of endothelial cells, surrounded by mural cells including smooth muscle cells and an outermost adventitia layer containing fibroblasts and other cell types (Passman et al.