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- 15:17, 1 September 2012 Z8600021 talk contribs uploaded File:Congdon1922-20.jpg (==Figs. 20. The descent of the fourth aortic arch and the definitive aortic arch into the thorax== Shown in relation to the cervical vertebrae and ribs. Legend * Asterisk - so-called fifth aortic arch * 4 - fourth aortic arch * d. a. - definitive aorti)