. Comparative anatomy. Anatomy, Comparative. For orientation. Vasa k vasorum Fat cells' ^yfe?^. ^^^^ Fig. 300.—A section through a human ulnar artery and vein, showing the wall of the artery on the left and of the vein on the right. The upper part of the figure {a-d) is from a section of the same vessels stained with resorcin-fuchsin, an elastic tissue stain. a. Circular, and b, radial elastic fibers of the media of the artery; c, external elastic membrane; d, elastic fibers in the media of the vein; e, circular, and g, longitudinal muscle fibers of the media; /, endothelium. XS50. (From Breme
. Comparative anatomy. Anatomy, Comparative. For orientation. Vasa k vasorum Fat cells' ^yfe?^. ^^^^ Fig. 300.—A section through a human ulnar artery and vein, showing the wall of the artery on the left and of the vein on the right. The upper part of the figure {a-d) is from a section of the same vessels stained with resorcin-fuchsin, an elastic tissue stain. a. Circular, and b, radial elastic fibers of the media of the artery; c, external elastic membrane; d, elastic fibers in the media of the vein; e, circular, and g, longitudinal muscle fibers of the media; /, endothelium. XS50. (From Bremer's "Text Book of ;) ventral aorta largely short-circuiting the gills. In anura gills are lost and blood passes directly through the aortic arches to the dorsal aorta. In the anura the fifth pair of aortic arches degenerate. That portion, the ductus arteriosus, which connects the pulmonary branches of the sixth aortic arch with the dorsal aorta also atrophies. The third pair of arches persist as the roots of the carotid arteries. In reptiles as in anura three pairs of aortic arches persist, the 3rd, 4th, and 6th in part as pulmonary. In reptiles the common carotid arteries connect with the right and not with the left systemic or fourth aortic arch. In mammals portions of. 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 Neal, Herbert V. (Herbert Vincent), 1869-1940; Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : P. Blakiston's Son
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