. The chordates. Chordata. Circulatory System :: blood the excess sugar, picked up by the blood in the walls of the di- gestive tube, before it passes into the general circulation. This charac- teristic hepatic-portal system is well developed in all Fig. 76. Venous system of a urodele amphibian; ventral view, (ab) Abdominal vein; (av) venae advehentes; (erf) duct of Cuvier; (ej) external jugular; (h) heart; (tip) hepatic-portal; (il) iliac; (j) jugular; (/) liver; (/c) lateral cutaneous; (m) meso- nephros; (p) postcava; {pc) postcardinal; (r) venae reve- hentes; (sc) subclavian.
. The chordates. Chordata. Circulatory System :: blood the excess sugar, picked up by the blood in the walls of the di- gestive tube, before it passes into the general circulation. This charac- teristic hepatic-portal system is well developed in all Fig. 76. Venous system of a urodele amphibian; ventral view, (ab) Abdominal vein; (av) venae advehentes; (erf) duct of Cuvier; (ej) external jugular; (h) heart; (tip) hepatic-portal; (il) iliac; (j) jugular; (/) liver; (/c) lateral cutaneous; (m) meso- nephros; (p) postcava; {pc) postcardinal; (r) venae reve- hentes; (sc) subclavian. (Cour- tesy, Kingsley: "Comparative Anatomy of Vertebrates," Philadelphia, The Blakiston Company.) Renal-Portal System. A second portal system, but less constant in its degree of development, is related to the kidneys. In fishlike verte- brates the caudal vein (derived from an embryonic subintestinal vein) bifurcates at the base of the tail to form right and left branches (Fig. 71A-C). Each of these, except in fishes, joins with the iliac vein com- ing in from the adjacent pelvic appendage. The resulting trunk passes. 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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