Question

question
which of the following layers of the heart wall is relatively thin, and contains layers that form figure - eights as they pass from atrium to atrium?
answer
atrial myocardium
atrial epicardium
atrial endocardium
ventricular myocardium

Explanation:

The atrial myocardium is relatively thin compared to the ventricular myocardium. The atrial myocardium has layers that form figure - eights as they pass from atrium to atrium. The epicardium is the outer layer of the heart (visceral layer of the serous pericardium), and the endocardium is the inner lining. The ventricular myocardium is thick to pump blood out of the heart.

Answer:

Atrial myocardium