File:Congdon1922-1-16.jpg

Figs. 1 to 16. Ventral views of aortic-arch system

Showing successive developmental stages. In the earliest stage only the first arch is present, while in the last (a full-term fetus) the vessels have acquired nearly their adult form. The so-called fifth arch is indicated by asterisk.

• Figure 1, embryo No. 2053, length 3 mm.
• Figure 2, embryo No. 12016, length 3 mm.
• Figure 3, embryo No. 836, length 4 mm.
• Figure 4, embryo No. 588, length 4 mm.
• Figure 5, embryo No. 1075, length 6 mm.
• Figure 6, embryo No. 1380, length 6 mm.
• Figure 7, embryo No. 810, length 5 mm.
• Figure 8, embryo No. 617, length 7 mm.
• Figure 9, embryo No. 792, length 8 mm.
• Figure 10, embryo No. 1121, length 11 mm.
• Figure 12, embryo No. 1771, length 13 mm.
• Figure 13, embryo No. 940, length 14 mm.
• Figure 14, embryo No. 74, length 16 mm.
• Figure 15, embryo No. 1390, length 18 mm.
• Figure 16, full-term fetus.

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