Meanwhile, the inner serous pericardium consists of an inner visceral layer, or epicardium — which is actually part of the heart wall — and an outer parietal layer.

同时，内部浆液性心包由内部内脏层或心外膜——实际上是心壁的一部分——和外部顶层组成。

Unlike both stable and unstable angina, in this case the coronary artery's constricted so severely that all layers of the heart wall being supplied are affected, therefore it's referred to as transmural ischemia.

与稳定型、非稳定型不同，这种情况下冠状动脉极度收缩，心壁所有层都受影响，因此，也被称为透壁性缺血。

Whatever the case, the heart needs blood, and if we look at the heart wall, there's three layers—the outermost layer, the epicardium, then the myocardium in the middle, and the endocardium inside the heart.

无论什么情况下，心肌都需要供血，我们学习心壁时知道，心壁有3层：最外层的心外膜、中层的心肌，以及心脏内的心内膜。