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The myocardium you can kind of appreciate just without even having me pointed it out,
關于心肌層，可能不需要我說，大家也知道
because it's the most common part of this entire thing, right?
這是心臟中非常常見的部分
So this is our myocardium.
這是心肌層
Let me go back and actually label the endocardium as well.
把心內膜也標上
And on the other side- endocardium- and actually just notice that the words are all pretty similar.
大家可以發現，這些術語的拼寫都非常相似
Myo- means muscle.
詞首myo代表肌肉
And actually while I'm on the myocardium, let me just point out one more thing.
說到心肌層，再來補充一點
The myocardium is where all of the contractile muscle is going to be. Right?
心肌層是由收縮肌組成的
That's where a lot of the work is being done.
它們來完成很多心臟的工作
And that's also where a lot of the energy is being used up.
同時也會消耗大量能量
So when the heart needs oxygen, it's usually the myocardium,
當心臟需要氧氣時，就要用到心肌層
because that's the part that's doing all of the work.
心臟工作就靠心肌層
Now on the other side of the myocardium, what do we have on the outside?
再看心肌層的外邊，外層是什么呢？
We have a layer called the pericardium.
再向外就是心包膜
Let me try to draw that for you.
我畫一下
The pericardium is something like this, kind of a thin layer.
心包膜就是這樣薄薄的一層膜
The interesting thing about pericardium is that there are actually two layers to it.
心包膜有一個特點，它其實是兩層的
It's actually something like this.
像這樣
Where you have two layers, an inner layer and an outer layer
一個內層，一個外層
and between the two layers you have literally a gap.
兩層之間有一個間隙
There's a gap right there.
這里存在一個間隙
In that gap you might have a little bit of fluid, but it's not actually cells.
間隙中有一些漿液，并不存在細胞
I guess that's the biggest point,
這是很重要的一點
it's not actually cells, it's more just a little bit of fluid that hangs out there.
中間并不是細胞，而是漿液
So this whole thing is called the pericardium.
這部分叫做心包膜
