. Carnegie Institution of Washington publication. AORTIC-ARCH SYSTEM IN THE HUMAN EMBRYO. 55 which the fourth arch had been very recently completed, and also of 4 at the beginning of the post-branchial period, when the arches were about to lose their identity. The measurements were divided by the magnification of the model and corrected approximately for shrinkage. Between the two periods the average length of each showed a negligible increase of less than 5 per cent. The failure. Figs. 1 to 16. Ventral views of aortic-arch system, showing successive developmental stages. In the earliest stage
. Carnegie Institution of Washington publication. AORTIC-ARCH SYSTEM IN THE HUMAN EMBRYO. 55 which the fourth arch had been very recently completed, and also of 4 at the beginning of the post-branchial period, when the arches were about to lose their identity. The measurements were divided by the magnification of the model and corrected approximately for shrinkage. Between the two periods the average length of each showed a negligible increase of less than 5 per cent. The failure. 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 Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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