. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. 296 COMPARATIVE MORPHOLOGY OF VERTEBRATES. into two tubes. This is continued in the anterior part of the truncus by a horizontal septum (short in urodeles, longer in anura) separating aortic and pulmonary trunks, the former subdivided in a similar way a little farther forward into carotid and aortic portions. In the early larvae of the amphibia each fully developed aortic arch except the last extends into the gills, but as the branchiae begin to be absorbed, a small vessel connecting the afferent and efferent a
. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. 296 COMPARATIVE MORPHOLOGY OF VERTEBRATES. into two tubes. This is continued in the anterior part of the truncus by a horizontal septum (short in urodeles, longer in anura) separating aortic and pulmonary trunks, the former subdivided in a similar way a little farther forward into carotid and aortic portions. In the early larvae of the amphibia each fully developed aortic arch except the last extends into the gills, but as the branchiae begin to be absorbed, a small vessel connecting the afferent and efferent arteries at the base of each gill enlarges and. FIG. 300.—Heart and adjacent parts of Protopterus, after Rose a, atrium; aoe, cesophageal artery; /, air bladder (lung); c, conus; h, hepatic vein; ji, is, superior and inferior jugular veins; oe, oesophagus; pa, pulmonary artery; pc, postcardinal vein; ph, pharyngeal artery; s, sinus venosus; sc, subclavian vein; 1-4, afferent branchial ^aortic) arteries. becomes the path of the main blood stream and a part of the arch of the adult (fig. 304). Of these four arches—3, 4, 5, and 6 of the primitive scheme—the fifth is lost in the adults of all except a few urodeles and cascilians. The fourth connects with the dorsal aorta and the sixth with the pulmonary arteries. These last, which often have a ductus Botallii, are noticeable for the large cutaneus arteries—anterior and posterior—which arise from them and which play an important part in respira-. 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 Kingsley, J. S. (John Sterling), 1854-1929. Philadelphia, P. Blakiston's son & co.
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