L4.2.2: Walls of the Heart

• WALLS OF THE HEART

  ● Epicardium

  ● Myocardium

  ● Endocardium
• WALLS OF THE HEART

  ● Epicardium

  ○ Outside layer

  ○ The visceral pericardium

  ○ Comprised of mesothelial cells and fat and connective tissues
• WALLS OF THE HEART

  ● Myocardium

  ○ Middle layer

  ○ Comprised of cardiomyocytes: thick bundles of cardiac muscles twisted and whorled into ringlike arrangements

  ○ The layer that contracts
• WALLS OF THE HEART

  ● Endocardium

  ○ Inner layer known as “endothelium”

  ○ Comprised of a layer of endothelial cells and a layer of subendocardial connective tissue

  ○ Continuous with the linings of the blood vessels leaving and entering the heart