The Cusps of the AV Valves are Extensions of Which

Question

The cusps of the AV valves are extensions of which layer of the heart wall?
A) epicardium
B) parietal pericardium
C) myocardium
D) endocardium

Accepted Answer

The endocardium is the innermost layer of the heart wall, which lines the chambers of the heart and is continuous with the blood vessels. The cusps of the AV valves are formed by the endocardium and connective tissue.