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- 17:59, 7 May 2011 S8600021 talk contribs uploaded File:Congdon1922-27-28.jpg (==Figs. 27 and 28. Stages in the formation of the vertebral artery== In figure 27 (embryo No. 721, 9 mm.), two segmental arteries arc interrupted but no anastomoses have yet formed between them. In figure 28 (embryo No. 143, 9 mm.), retrocostal anastom)
