"The subclavian artery ascends laterally to exit through the thoracic inlet, crossing posteriorly to the anterior scalene muscle. It gives off several branches for the head, neck and chest as well as scapular branches before it becomes the axillary artery at the lateral border of the first rib."
"The radial and ulnar arteries extend along either side of the forearm to the wrist. Proximally, they both give rise to recurrent arteries that ascend to complete the arterial anastomoses of the elbow. In addition, the ulnar artery gives off an interosseous branch that trifurcates to form anterior, posterior and recurrent branches."