评论
打印
本集视频介绍了心脏中的膜层结构和概念名称，帮助观者熟悉心脏的构造和工作原理，巩固基础知识。
n. 层
vi. 分层
vt. 将某
您现在的位置： 首页 > 英语听力 > 公开课 > 保健与医学:循环系统 > 正文
- Now you may be wondering
- 大家可能要问
- 'How on the world do you get a layer that has a gap within it?'
- 为什么会存在一个间隙呢？
- So let me actually try to show you what happens in a fetus.
- 我来画一下胚胎的情况
- Let's say you have a little fetus heart,a tiny little heart like this.
- 假设这是胚胎的心脏，这时候心脏非常小
- It gets a little bit bigger, like this.
- 然后慢慢长大
- And finally it gets into an adult heart, something like that.
- 最后这是成人的心脏
- This would be the adult heart, right?
- 这是成人的心脏大小
- Well, at the same time that the heart is growing,
- 那么，随着心脏长大
- you also have a sac, almost like a balloon. Right?
- 这里会形成一个囊腔，就像一个气球
- This balloon actually begins to envelope the heart.
- 这个囊腔把心脏包围起来
- This growing heart kind of grows right into the balloon.
- 心脏在气球状的膜内生长
- This balloon starts going around it, like that.
- 膜把心脏包围起来
- And you get something like this.
- 就像这样
- Eventually, as the heart gets really big, you get something like this.
- 最后，当心脏成型之后，就变成了这样
- You basically have this kind of inner layer of the balloon that's pancake dot.
- 气球内层
- It doesn't even look like a balloon anymore. It's very flat.
- 不再像气球了，而是变平了
- Then it folds back on itself, like that, and it comes all the way around.
- 然后自己向后翻折,像这样全部包裹起来
- Now you can see why- even though it's continuous,
- 大家可以看到，这是连续的膜
- I mean, it's not like it breaks, it is continuous here,
- 膜本身并没有破损
- you can see how, if you actually just were to look at at chunk of it,
- 如果大家看其中的一部分
- like we're looking at right here, you could see how it would look like a pancake.
- 比方说这里，大家会看到，这就像一张薄饼
- On our heart it actually- it literally would be something like this, like a very thin kind of pancake.
- 而心脏就像这样，非常像一张薄饼
- And I'm not doing a very very good job making it look thin,
- 我画的不是太薄
- but you can imagine what it is,
- 大家想象一下就可以了
- that it could look like if I were to zoom in on it, basically something like that,
- 如果我们放大来看的话，这里就像这样
- where you have two layers that are basically just kind of turned in on themselves.
- 两层膜就像这样
- Both layers put together are called your pericardium.
- 这两层膜就叫做心包膜
- There are actually separate names for the two layers.
- 实际上，两层膜分别有自己的名字
- For example, the layer that's kind of hugging up against the heart,
- 包围心脏的这层膜
- this layer that I'm drawing now, this layer is called the visceral pericardium.
- 也就是我在画的这层，这个叫做心外膜
- So you call that the visceral pericardium.
- 这层是心外膜
- The name visceral, this right here would be visceral,
- 这是心外膜
- the reason it's called visceral is because viscero- means organs.
- 前缀viscero-意思是内脏
- So that's called the visceral pericardium.
- 这层膜叫心外膜
- This outer layer, the one I'm drawing now, is called the parietal pericardium.
- 而这外边的一层是心包壁层
- That's the layer that actually is on the outside.
- 也就是在心脏外层的这层
- Let me label that as well. So that's this guy.
- 我标一下，这是心包壁层
- That would be the parietal pericardium.
- 这是心包壁层
- Now you can actually see the layers of the heart, the endocardium, myocardium and pericardium.
- 大家现在可以看到心脏的层次结构了，分为心内膜，心肌层，心包膜
- And actually just to throw you a curveball, becasue I'm pretty sure you can handle it,
- 再给大家出个题目，相信大家能够解答
- this visceral pericardium, another name for it, just because you might see it sometime, is the epicardium.
- 大家可能会看到，心外膜有别的术语名称叫epicardium(心外膜)
- Sometimes you might see it, the epicardium.
- 大家可能会遇到
- Don't get thrown off; it's really just the visceral pericardium.
- 不要混淆，这就是心外膜
- It's just the outermost layer of that heart before you get to the parietal layer.
- 指的就是除了心包壁层以外，心脏最外面的一层
扫描二维码进行跟读打分训练
- 阅读本文的人还阅读了：
可可英语官方微信(微信号:ikekenet)
每天向大家推送短小精悍的英语学习资料.
添加方式1.扫描上方可可官方微信二维码。
添加方式2.搜索微信号ikekenet添加即可。
添加方式1.扫描上方可可官方微信二维码。
添加方式2.搜索微信号ikekenet添加即可。
