. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative. Fig. Fig. 259. Fig. — Section through the Ventricles of Orus finerea. Vcl, right, and Vij, left ventricle ; S, septum ventriculoruni. Fig. —He.\rt of OniithorhynchiLsparadoxua. From the dorsal side. (After Rose.) , T'.c'.'.'.f/, precaval veins ; I'., postcaval; I'., coronarv vein ; , coronary sinus; , pulmonary veins; Ao, aorta; , , pulmonary arteries; , right atrium ; , Spatium intersepto-valvulai-e. the left aortic arch persists (Fig. 243, E, f) ; th
. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative. Fig. Fig. 259. Fig. — Section through the Ventricles of Orus finerea. Vcl, right, and Vij, left ventricle ; S, septum ventriculoruni. Fig. —He.\rt of OniithorhynchiLsparadoxua. From the dorsal side. (After Rose.) , T'.c'.'.'.f/, precaval veins ; I'., postcaval; I'., coronarv vein ; , coronary sinus; , pulmonary veins; Ao, aorta; , , pulmonary arteries; , right atrium ; , Spatium intersepto-valvulai-e. the left aortic arch persists (Fig. 243, E, f) ; the corresponding arch of the other side in both cases gives rise to part of the subclavian artery. Thus in both Birds and Mammals there is only a single aortic arck. As in Amphibians, the posterior arterial arch gives rise to the pulmonary artery. The pulmonary veins, two from each lung, open close together into the left atrium (Fig. !J). Amongst the more important points in the development of the heart may be mentioned the fact that in the embr}''0 the two atria communicate with one another secondarily by means of the foramen ovnle, through which the blood from the postcaval passes into the left ventricle (Fig. 260). This foramen closes up when the lungs ' There are no chordfe tendlnea; in ilonotieraes, the heart of which in many respects resembles that of the 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 Wiedersheim, Robert, 1848-1923; Parker, William Newton, 1857-1923. London, Macmillan
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