Which are the first arteries to branch off the aorta?

The aorta is usually divided into five segments/sections:

1. Ascending aorta: the section between the heart and the arch of aorta

2. Arch of aorta-the peak part that looks somewhat like an inverted "U"

3. Descending aorta-the section from the arch of aorta to the point where it divides into the common iliac arteries

4. Thoracic aorta-the half of the descending aorta above the diaphragm

5. Abdominal aorta-the half of the descending aorta below the diaphragm