. The anatomy of the frog. Frogs -- Anatomy; Amphibians -- Anatomy. The frog's heart seen from the ventral surface, and dissected so as to show its structure. The ven- tral walls of the truncus arteriosus and of the auricles and ventricle have been removed. From a drawing by Mr. Hurst. appears to be absent (Fig. 135). Fig. 134. The septum is attached to the walls of the auricles so as to form two distinct cavities, which communicate at the aviriculo- ventricular opening-, where the septmn has a free concave border (Fig. 134). The right am-icle is much larger than the left, and receives the sys
. The anatomy of the frog. Frogs -- Anatomy; Amphibians -- Anatomy. The frog's heart seen from the ventral surface, and dissected so as to show its structure. The ven- tral walls of the truncus arteriosus and of the auricles and ventricle have been removed. From a drawing by Mr. Hurst. appears to be absent (Fig. 135). Fig. 134. The septum is attached to the walls of the auricles so as to form two distinct cavities, which communicate at the aviriculo- ventricular opening-, where the septmn has a free concave border (Fig. 134). The right am-icle is much larger than the left, and receives the systemic venous blood from the sinus venosus by the opening (Figs. 133 and 134 SV.) already de- scribed. The left auricle re- ceives the blood from the lungs by the pulmonary vein (Fig. 133 PV.), which opens into the auricle near the septum (Fig. 134 PF.) : [the openings from the sinus venosus and from the pulmonary vein may be so closely approximated as to be separated by the septum only. The septum is much thinner than the auricular walls]. Both auricles open into the ventricle by the auriculo-ventricular open- ing (Fig. 134). c. The ventricle (Figs. 133, still living, is seen to be bluntly conical in shape and darker on the left side than on the right ; this is due to the ventricular wall of the right side, near the truncus arteriosus, being- somewhat thinner. The inner wall is not smooth but possesses muscular ridges {Trahecnlae). At its base the ventricle communicates with the aui'icles by the auriculo-ventricular opening (Figs. 134 and 136), and with the truncus arteriosus by a separate opening (Fig. 134 A.). The ventricle is lined by a layer of endocardial endothelium. c. p. p'. Auriculo-ventricular aperture and valve. Aperture leading from ventricle to truncus arteriosus. Left carotid arch. Left auricle. Left pulmo-cutaneous arch. Style passed down right pulmo-cutaneous arch into the truncus arteriosus, T. P V. Opening of pulmonary vein. RA. Right auricle. S. Left systemic
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Keywords: ., bookcentury1800, bookdecade1880, bookpublisheroxfordclarendonpre
