Aortic Arch

brachiocephalic (right Aortic Arch) T4 = carina + sternal angle + aortic arch (gives rise to RCC, R Vertebral, then R Subclavian)
left common carotid
left subclavian

Why would contrast injection in the left subclavian only visualize the posterior circulation ?
- b/c the left vertebral artery arises from the left subclavian, whereas the left CC arises from the Aorta.
Why would contrast in injection in the right subcavian (via the brachial) visualize both anterior and posterior circulation ?
- b/c the RCC and R Vertebral both arise from the right subclavian (the brachiocephalic artery).