This endocardium lines the heart chambers as well as the heart valves.

心内膜覆盖了心脏各腔室和瓣膜。

Therefore the classic finding with angina is subendocardial ischemia, meaning less oxygen is reaching the region just under the endocardium.

因此心绞痛的典型发现就是心内膜下层缺血，即到达心内膜下层的氧减少。

The process tending to focus on the sub endocardium.

趋向于集中于心内膜下的过程。

The muscle is enclosed on the outside by the epicardium and on the inside by the endocardium .

心脏被纤维囊（心包）完全包裹。

If blood flow's reduced or the myocardium is thicker, blood has a harder time reaching this deeper layer just under the endocardium, called the subendocardium.

一旦血流减少或心肌变厚，血流便难以到达最深层，即心内膜下层。

Yet another is endocardial fibroelastosis, where fibrosis develops in the endocardium, the inner lining of the heart, as well as the subendocardium right under, again making the tissue less compliant.

还有另一种病因是心内膜弹力纤维增生症，即在心内膜以及心内膜下层发生了纤维化，使得心脏组织顺应性变差。

Finally, there's the innermost layer of the heart called the endocardium, which is made of a relatively thin layer of endothelium which is the same layer of cells that line the blood vessels.

最后，心脏的最内层叫心内膜，由一层较薄的内皮细胞构成；与位在血管内壁的是同一层细胞。

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。