Let's start with the basic structural units of bone, called osteons.

让我们从骨骼的基本结构单元开始，称为骨单位。

We also went over the microanatomy of bones, particularly the osteons and their inner lamella.

我们还回顾了骨骼的显微解剖学，尤其是骨及其内部骨板层。

And these circular structures are called osteons.

这些圆形结构被称为骨元。

As the dinosaur grows, it adds more osteons to the outside of the bone.

随着恐龙的成长，它会在骨骼外部添加更多的骨元。

The cortical bone, in turn, is made up of many functional, pipe-like units called osteons, which run through the length of the bone.

皮质骨由很多叫做“骨单位”的功能性管状单位构成，贯穿了整段骨骼。

In the center of these osteons, there are hollow spaces called Haversian canals, which contain the blood supply and innervation for the bone cells.

在这些骨单位的中心，这个中空的部分被称作哈弗斯管，提供了为骨细胞供应血液以及神经支配的空间。

Now, bone needs nourishment like any other tissue, so running along the length of each osteon are central canals, which hold nerves and blood vessels.

现在，骨骼和其他组织一样需要营养，所以沿着每个骨骼的长度运行的是中央管道，它容纳神经和血管。

If you remember from the previous lesson, we talked about the micro-structure of bones and how they are made of small cells called osteons.

如果您还记得上一课，我们谈到了骨骼的微观结构以及它们是如何由称为骨元的小细胞构成的。

Look inside one and you'll see that they're composed of tubes inside of tubes, so that a cross-section of an osteon looks like the rings of a tree trunk.

看看里面，你会看到它们是由管子里的管子组成的，所以骨头的横截面看起来像树干的年轮。

When we look through a thin section of dinosaur bone, the pattern of these osteons looks more like that found in endothermic animals rather than that found in ectothermic animals.

当我们透过一块薄薄的恐龙骨头观察时，这些骨元的模式看起来更像是在吸热动物中发现的，而不是在变温动物中发现的。