. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 414 The third aortic arch is the largest of the aortic vessels present, and in this embryo is larger than in any other stage observed. It is a short, tubular vessel of fairly regular outline, but its walls do not present the thickened appearance of the dorsal aorta of this stage. The fourth arch, although longer, is smaller in diameter than the third, and, upon either side, in the region of its union with the dorsal aorta, a small cord of mesoderm passes through its \ Fig. 7. Reconstruction of Aortic arches in Pig e
. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 414 The third aortic arch is the largest of the aortic vessels present, and in this embryo is larger than in any other stage observed. It is a short, tubular vessel of fairly regular outline, but its walls do not present the thickened appearance of the dorsal aorta of this stage. The fourth arch, although longer, is smaller in diameter than the third, and, upon either side, in the region of its union with the dorsal aorta, a small cord of mesoderm passes through its \ Fig. 7. Reconstruction of Aortic arches in Pig embryo of the 20th day. X about 45. The most posterior arch in this embryo has been considered the sixth, both because of its great distance from the fourth, and because a fifth arch usually appears at a considerably later period. This vessel is complete in its ventral half, and at its blind termination gives off a posteriorly directed vessel which, though as yet small and broken in its course, appears to be an element of the pulmonary artery. Embryo of the twentieth day (number 2). This em- bryo is nearly of the same age as the preceding but shows variations. 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 Anatomische Gesellschaft. Jena : G. Fischer
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