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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 anastomoses have formed between all but the first and second segmental arteries.

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	17:59, 7 May 2011		997 × 612 (68 KB)	S8600021 (talk \| contribs)	==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

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