. The chordates. Chordata. Circulatory System 75. Fig. 75. Diagrams illustrating stages in the development of the systemic veins of the pig. The cardinal and omphalomesenteric veins are shown in black, the sub- cardinal system is stippled, the supracardinals are horizontally hatched, and vessels arising independently of these three systems are indicated by small crosses. [A) Ground plan of the veins of a young mammalian embryo. (B) Cross section (al level of arrow in A) showing dorsoventral relations of the various veins (C) dia- grammatic plot of veins of 5-6 mm. pig embryos. (D) Arrangement
. The chordates. Chordata. Circulatory System 75. Fig. 75. Diagrams illustrating stages in the development of the systemic veins of the pig. The cardinal and omphalomesenteric veins are shown in black, the sub- cardinal system is stippled, the supracardinals are horizontally hatched, and vessels arising independently of these three systems are indicated by small crosses. [A) Ground plan of the veins of a young mammalian embryo. (B) Cross section (al level of arrow in A) showing dorsoventral relations of the various veins (C) dia- grammatic plot of veins of 5-6 mm. pig embryos. (D) Arrangement of veins in. 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 Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : Blakiston
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