. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates. HEART 403 (Fig. 305), and from the aortic root in Protopterus and Lepidosiren, that of the right side bifurcating to supply the dorsal surface of the lung, while that of the left side supplies the ventral surface. The two pulmonary veins unite to form a median trunk which becomes closely connected with the sinus venosus, so as to appear sunk within its walls in the form of two valve-like projectionsl (Fig. 304). Thus the blood once more becomes purified before it passes into the left side of the ventricle. A post- caved v
. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates. HEART 403 (Fig. 305), and from the aortic root in Protopterus and Lepidosiren, that of the right side bifurcating to supply the dorsal surface of the lung, while that of the left side supplies the ventral surface. The two pulmonary veins unite to form a median trunk which becomes closely connected with the sinus venosus, so as to appear sunk within its walls in the form of two valve-like projectionsl (Fig. 304). Thus the blood once more becomes purified before it passes into the left side of the ventricle. A post- caved vein, present from the Dipnoi onwards, opens into the sinus venosus posteriorly to the precavals, and with it the hepatic veins communicate (Figs. 305 and 328). Amphibians.—With the exception of the Gymnophiona, the heart in all Amphibians lies far forwards, below the anterior vertebras. A septum atriorum is present,'2 but in Urodela and Gymnophiona it is more or less fenestrated (Fig. 307): it never completely separates the cavities of the two atria, and forms an arch over the atrioventricular aperture. There. 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, W. N. (William Newton), d. 1923. London, Macmillan and co. , limited
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