By an embryo's fifth week of development, these main three chambers start morphing into five secondary vesicles that essentially form the roots of what will become your grown-up brain structures.

到胚胎发育的第五周，这三个主要的腔室开始变成五个次要的囊泡，它们基本上形成了你成年大脑结构的根。

We looked at how the brain develops from an unassuming neural tube into three primary vesicles, and then five secondary vesicles, and finally into our complex set of four adult structures and their basic functions.

我们观察了大脑是如何从一个不起眼的神经管发展成三个初级囊泡的，然后是五个次级囊泡，最后进入我们复杂的四个成人结构及其基本功能。