. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. 286 COMPARATIVE ANATOMY. The blood from the right ventricle passes into the latter as well as into the left aortic arch, and, according as the septum ventricu- lorum is complete or incomplete, is either entirely venous (Croco- diles) or mixed (other Reptiles, Fig. 229, C). The valves of the heart have undergone a considerable reduction in Reptiles : at the origin both of the aorta and of the pulmonary artery there is only a single row ; this is also the case in all other Aimiiota. Birds and Mamm
. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. 286 COMPARATIVE ANATOMY. The blood from the right ventricle passes into the latter as well as into the left aortic arch, and, according as the septum ventricu- lorum is complete or incomplete, is either entirely venous (Croco- diles) or mixed (other Reptiles, Fig. 229, C). The valves of the heart have undergone a considerable reduction in Reptiles : at the origin both of the aorta and of the pulmonary artery there is only a single row ; this is also the case in all other Aimiiota. Birds and Mammals.—In these, the atrial and ventricular septa are always complete, and there is no longer any mixture of the arterial and venous blood. The ventricles are much larger than. -V FIG. 230.\.—HEART OF THE SWAN, WITH THE KIUHT VENTRICLE err OPEN Vw, ventral wall of right ventricle turned on one side, thus putting the atrio-ven- tricular valve—which arises by two muscular folds, a and b—on the stretch ; t, point of insertion of these folds on the ventral wall of the ventricle : above r is the atrio-ventricukr aperture ; ,V, septum ventrieulorum ; *, *, *, the three semilunar valves of the pulmonary artery ; V, left 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, New York, Macmillan
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