. Elemente der vergleichenden Anatomie der Wirbeltiere. Anatomie, Vergleichende. Gefäßsystem 307 kontraktilen Bulbus arteriosus liegt in der Regel in der Nähe der Ventrikel (Abb. 246, c). o Die Herzen der Fische enthält venöses Blut nur, die es zwingt. Fia, 246. âDiAfiRAMMATic Längsschnitt thkough die Herzen der Vakious Fische. (Von der Boas Zoologie.) EIN, Fisch mit gut entwickelten Conus anteriosns {z.b. Elasmobranoh); B, Amia; G, ein Teleost. In B und C der Sinus venosus und Atrium werden nicht angegeben. a, Atrium; h, bulbus arteriosus;>, conus arteriosus;/; Ventile; t, ventralen Aorta; v

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. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative. VASCULAR SYSTEM 307 contractile bulbus arteriosus usually lies close against the ventricle (Fig. 246, c). o The heart of Fishes contains venous blood only, which it forces. Fia, 246.âDiAfiRAMMATic Longitudinal Section thkough the Hearts of Vakious Fishes. (From Boas's Zoology.) A, Fish with well developed conus anteriosns {e.g., Elasmobranoh); B, Amia ; G, a Teleost. In B and C the sinus venosus and atrium are not indicated. a, atrium ; h, bulbus arteriosus ; >â , conus arteriosus ; /;, valves ; t, ventral aorta ; v, ventricle. smus venosus : through the afferent branchial arteries (Figs. 243, B, 245, c, and 264) into the capillaries of the gills, where it becomes oxygenated, to pass thence into the efferent branchial arteries, and so into the aortic roots. Dipnoi.âIn the Dipnoi, as in Fishes proper, the heart lies far forwards, near the head. In correspondence with the double mode of respiration, by lungs as well as by gills, it reaches a stage of development mid-way between that seen in Elasmo- branchs and in Amphibians (Figs. 247 and 248). The atrium becomes divided into a left and a right chamber by a septum, as does also the ventricle to some extent, owing to the presence of a cushion composed of muscular fibres and connective-tissue (Fig. 247) situated between the atrium and ventricle, and extending into both of these chambers: this acts as a valve, ordinary atrio- ventricular valves being absent. The sinus venosus, from the Dipnoi onwards, opens into the right atrium. The conus arteriosus is twisted spirally on itself (Fig. 248): in Ceratodus it is provided with eight transverse rows of valves, and X 2. 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 work.. Wiedersheim, Robert, 1848-1923; Parker, William Newton, 185

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• bookcentury1800
• bookdecade1890
• booksubjectanatomycomparative