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

降主脉两，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指大血管" Great vessels" ，包括了上腔静脉、下腔静脉、升主脉、主脉弓、肺脉与降主脉。

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，我们将学习降主脉，它从主脉弓开，两，胸主脉和腹主脉。

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.

主脉离开心脏后，在主脉弓处作一U形转弯，当穿过胸腔和腹时，被称降主脉。

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.

关于降主脉，需要注意的主要问题是它有许多支从降主脉上支，就像小道从高速公路上支一样。