Figure 24-1. A, The three arteries (1, 2, 3) usually given off by the arch of the aorta. Also shown are the brachiocephalic and superior caval veins in outline (as if transparent) and the trachea, esophagus, and phrenic and vagus nerves. Note the different course of the recurrent laryngeal nerves on the two sides, the left nerve being related to the ligamentum arteriosum. Cf. fig. 50-17. B, An instance in which a retro-esophageal right subclavian artery (*) arises as the last branch of the arch of the aorta. Click for high resolution image.