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The myocardium you can kind of appreciate just without even having me pointed it out,
关于心肌层，可能不需要我说，大家也知道
because it's the most common part of this entire thing, right?
这是心脏中非常常见的部分
So this is our myocardium.
这是心肌层
Let me go back and actually label the endocardium as well.
把心内膜也标上
And on the other side- endocardium- and actually just notice that the words are all pretty similar.
大家可以发现，这些术语的拼写都非常相似
Myo- means muscle.
词首myo代表肌肉
And actually while I'm on the myocardium, let me just point out one more thing.
说到心肌层，再来补充一点
The myocardium is where all of the contractile muscle is going to be. Right?
心肌层是由收缩肌组成的
That's where a lot of the work is being done.
它们来完成很多心脏的工作
And that's also where a lot of the energy is being used up.
同时也会消耗大量能量
So when the heart needs oxygen, it's usually the myocardium,
当心脏需要氧气时，就要用到心肌层
because that's the part that's doing all of the work.
心脏工作就靠心肌层
Now on the other side of the myocardium, what do we have on the outside?
再看心肌层的外边，外层是什么呢？
We have a layer called the pericardium.
再向外就是心包膜
Let me try to draw that for you.
我画一下
The pericardium is something like this, kind of a thin layer.
心包膜就是这样薄薄的一层膜
The interesting thing about pericardium is that there are actually two layers to it.
心包膜有一个特点，它其实是两层的
It's actually something like this.
像这样
Where you have two layers, an inner layer and an outer layer
一个内层，一个外层
and between the two layers you have literally a gap.
两层之间有一个间隙
There's a gap right there.
这里存在一个间隙
In that gap you might have a little bit of fluid, but it's not actually cells.
间隙中有一些浆液，并不存在细胞
I guess that's the biggest point,
这是很重要的一点
it's not actually cells, it's more just a little bit of fluid that hangs out there.
中间并不是细胞，而是浆液
So this whole thing is called the pericardium.
这部分叫做心包膜
