Heart LO3

3.) Conceptualize the three layers of the heart wall.

There are three layers of the heart wall (from superficial to deep):

  • Epicardium (visceral serous pericardium)
    • May be difficult to separate from the deep epicardial fat
      • Epicardial fat is varied in amount and distribution, but tends to collect in the coronary sulcus, anterior & posterior interventricular sulci, and around the origins of the great vessels
  • Myocardium
    • Cardiac muscle
      • Majority of the heart wall and varies in thickness
  • Endocardium
    • Internal layer of endothelium and connective tissue which lines internal chambers and valves