. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. FIG. 304. FIG. 305. FIG. 304.—Diagram of the aortic arches in amphibia. Arterial blood cross lined, venous black. The gill circulation omitted, its course indicated by arrows; the permanent circulation after the absorption of gills shown, eg, carotid gland; da, dorsal aorta; d, ductus Botalli; pa, pulmonary artery; va, ventral aorta; 3-6, aortic arches. FIG. 305.—Heart of snapping turtle, Chelydra serpentina (Princeton, 479). aa, aortic arch; c, cceliac artery; da, dorsal aorta; db, Botall's duct; ec, ic, exter
. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. FIG. 304. FIG. 305. FIG. 304.—Diagram of the aortic arches in amphibia. Arterial blood cross lined, venous black. The gill circulation omitted, its course indicated by arrows; the permanent circulation after the absorption of gills shown, eg, carotid gland; da, dorsal aorta; d, ductus Botalli; pa, pulmonary artery; va, ventral aorta; 3-6, aortic arches. FIG. 305.—Heart of snapping turtle, Chelydra serpentina (Princeton, 479). aa, aortic arch; c, cceliac artery; da, dorsal aorta; db, Botall's duct; ec, ic, external and internal carotids; la, left auricle; p, pulmonary artery; ra, right auricle; sc, subclavian artery; v, ventricle; m, mesenteric artery. tically empty at the time. The next portion of the blood, containing both arterial and venous, follows the next easiest course through the aortic arches, while the last to leave the ventricle, consisting of pure arterial blood, can only go into the carotids, where the resistance is greater on account of the small size of the vessels and the obstacles presented by the carotid glands. REPTILES.—In the reptiles the division of the heart (fig. 287) is carried still farther and the sinus venosus tends to be merged in the right atrium. The atrial septum is complete and is continued forward as a ventricular septum, partially. 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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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1912
