. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. FIG. 297.—Oblique ventral view of venous system of Petromyzon, drawn from a corro- sion preparation (Princeton, 669); ac, precardinal; c, caudal; gs, genital sinus; hv, hepatic vein; ij, inferior jugular; pc, postcardinal; sv, sinus venosus; va, ventral aorta. trunk running parallel to the body axis, just dorsal to the gill pouches. The inter- segmental arteries of the dorsal region are irregular, sometimes alternating, some- times appearing in pairs on the two sides of the median line. In the myxinoids (fig. 2
. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. FIG. 297.—Oblique ventral view of venous system of Petromyzon, drawn from a corro- sion preparation (Princeton, 669); ac, precardinal; c, caudal; gs, genital sinus; hv, hepatic vein; ij, inferior jugular; pc, postcardinal; sv, sinus venosus; va, ventral aorta. trunk running parallel to the body axis, just dorsal to the gill pouches. The inter- segmental arteries of the dorsal region are irregular, sometimes alternating, some- times appearing in pairs on the two sides of the median line. In the myxinoids (fig. 297) the subcardinals are united behind, the postcardinals in front, these latter uniting with the single inferior jugular of the left side to form the unpaired Cuverian duct, the presence of which renders the sinus venosus asymmetrical and. FIG. 298.—Anterior arterial vessels of the tile fish (Lopholatilus), after Silvester, a, auricle; ab, to air bladder; am, to angle of mouth; c, cceliac axis; d, dorsal arteries; da, dorsal aorta; ec, external carotid; g, genital artery; gs, gastrosplenic; h, hyoid artery; ha, hepatic; /, lingual; Ig, left gastric; m, mesenteric; mh, middle hypobranchial; o, ophthalmic; pa, parietal; po, postorbital; ps, pseudobranch; rg, right genital; so, supraorbital; v, ven- tricle; va, ventral aorta. forces the hepatic veins to empty into the right side. The hepatic portal receives a vein from the head, and then passes back to a contractile portal heart, just before it enters the liver. FISHES.—In the fishes, the dipnoi excepted, the circulation corresponds rather closely in its main features with the primitive condition described above. The. 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 Kingsley, J. S. (John Sterling), 1854-1929. Philadelphia, P. Blakiston's son & co.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1912
