. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 205 vein (c. [right] Fig. 2 C). The left posterior cardinal vein remains practically unchanged throughout development (c. [left] Fig. 2C). A series of stages in the formation of the vena cava may be arranged as follows. The most primitive condition is seen in Cera- todus (Fig. 2 A, B, C) where the vena cava is in part formed from a single posterior cardinal vein, the anterior portion of that vein re- maining present; the other cardinal vein is unmodified , and the hepatic. Fig. 2. Diagrams illustrating the fonuation of the ve
. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 205 vein (c. [right] Fig. 2 C). The left posterior cardinal vein remains practically unchanged throughout development (c. [left] Fig. 2C). A series of stages in the formation of the vena cava may be arranged as follows. The most primitive condition is seen in Cera- todus (Fig. 2 A, B, C) where the vena cava is in part formed from a single posterior cardinal vein, the anterior portion of that vein re- maining present; the other cardinal vein is unmodified , and the hepatic. Fig. 2. Diagrams illustrating the fonuation of the vena cava. A young Cera- todus. B young Ceratodus. C adult Ceratodus (schematized from Spencer). D Proto- pterus (schematized from Parker). E Salamandra (schematized from Wiedersheim). F Rana (schematized from Ecker), c. posterior cardinal vein. h. hepatic vein. vena cava. and caval veins are entirely separate. The next stage is seen in Protopterus and Lepidosiren (Fig. 2 D) where, although only one cardinal vein shares in the formation of the vena cava, its anterior portion disappears completely and the hepatic veins open into the vena cava instead of into the heart directly. A third stage appears in the Amphibia where the vena cava is formed partially by the fusion of. 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 Anatomische Gesellschaft. Jena : G. Fischer
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