The descending aorta is divided into two sections that are named for their location.

降脉分为两个部分，以其位置命名。

Lastly, G is for great vessels which includes the superior vena cava, inferior vena cava, ascending aorta, aortic arch, pulmonary artery, and descending aorta.

最后，G指大血" Great vessels" ，包括了上腔静脉、下腔静脉、升脉、脉弓、肺脉与降脉。

In this lesson, you will learn about the descending aorta, which begins at the aortic arch and is divided into two sections, the thoracic and the abdominal aorta.

本节课，我们将学习降脉，它从脉弓开始，分为两部分，胸脉脉。

After exiting the heart, the aorta makes a U-turn at the aortic arch and becomes known as the descending aorta as it plunges down through the thorax and abdomen.

脉离开心脏后，在脉弓处作一个U形转弯，当穿过胸腔部时，被称为降脉。

The main thing to note about the descending aorta is that it has a number of branches coming off of it, much like back roads would come off of a highway.

关于降脉，需要注意的要问题是它有许多分支从降脉上分支，就像小道从高速公路上分支一样。