So, moving from the outside of the heart to the inside of the heart: after the epicardium, there's the myocardium, which is the muscular middle layer.

从脏的外侧到脏的内部：在外膜后，有肌层，即中间的肌肉层。

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，内部由内部内脏层或外膜——实际上是壁的一部分——和外部顶层组成。

The coronary arteries start up in the epicardium, and then dive down and supply all the heart tissue.

冠状动脉在外膜发出，然后深入供应所有脏组织。

The inner layer is called the visceral layer, and it gets stuck tightly to the heart itself, forming the epicardium - or the outer layer of the heart.

而内层被称为脏层，它紧紧地贴合在脏上，形成外膜，即脏外层。

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，肌都需要供血，我们学习壁时知道，壁有3层：最外层的外膜、中层的肌，以及脏内的内膜。

The muscular walls of the heart consist of three major " layers" . The bulk of the walls is made up of a layer of cardiac muscle and is called the myocardium.

肌外层是外膜，内层是内膜。