Embryology
Embryologically, the left subclavian simply arises from the left 7th intersegmental artery, while the right subclavian arises, proximal to distal:
- aortic arch IV
- right dorsal aorta (between the 4th and the 7th intersegmental arteries)
- right 7th intersegmental artery
Read more about this topic: Subclavian Artery