. b'ig. 12. The gross anatomy of frog'8 heart. (Ventral view after Cyou, dorsal view after Howes.) A, aortae; B, right auricle; C, left auricle; D, pulmonary vein K, ventricle; F, sinus venosus; G, sinu-auricular valves; H, bulbus arteriosus. sinus joins the auricle ; also the frenum, a slender ligament which attaches the dorsal wall of the ventricle to the peri- cardium. b. Origin and Course of the JVavc of Contraction. I.—Inspection.—Try to observe the place where the wave of contraction begins, and the order in which it spreads over the different chambers of the heart. See that when a part
. b'ig. 12. The gross anatomy of frog'8 heart. (Ventral view after Cyou, dorsal view after Howes.) A, aortae; B, right auricle; C, left auricle; D, pulmonary vein K, ventricle; F, sinus venosus; G, sinu-auricular valves; H, bulbus arteriosus. sinus joins the auricle ; also the frenum, a slender ligament which attaches the dorsal wall of the ventricle to the peri- cardium. b. Origin and Course of the JVavc of Contraction. I.—Inspection.—Try to observe the place where the wave of contraction begins, and the order in which it spreads over the different chambers of the heart. See that when a part contracts and drives the blood out, it grows paler, while the part receiving the blood swells and flushes. Ans- wer in your notes the following questions: What is the action of the auricles during the ventricular diastole, and during the ventricular s)'Stole? What changes are observed in the ventricle during auricular diastole, and during auric- ular svstole?
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectphysiology, bookyear1
