What are the layers of the heart wall?

What are the layers of the heart wall?

• A. Epicardium, myocardium, and endocardium.
• B. Endocardium, myocardium, and epicardium.
• C. Pericardium, epicardium, and myocardium.
• D. Epicardium, myocardium, and pericardium.

Answer: (A)

The main concept is how the heart wall is organized from outside to inside. The heart wall has three layers in this order: the epicardium on the outside, the thick muscular myocardium in the middle, and the endocardium lining the interior chambers and covering the valves. The pericardium is a surrounding sac that encloses the heart but is not part of the wall itself. So the correct sequence is epicardium, then myocardium, then endocardium. Options that place endocardium on the outside or replace an interior layer with the pericardium don’t match the actual anatomy.

The main concept is how the heart wall is organized from outside to inside. The heart wall has three layers in this order: the epicardium on the outside, the thick muscular myocardium in the middle, and the endocardium lining the interior chambers and covering the valves. The pericardium is a surrounding sac that encloses the heart but is not part of the wall itself. So the correct sequence is epicardium, then myocardium, then endocardium. Options that place endocardium on the outside or replace an interior layer with the pericardium don’t match the actual anatomy.