. Text book of vertebrate zoology. Vertebrates; Anatomy, Comparative. MESOTHELIAL STRUCTURES. 105 break down, placing the coeloms of the two sides in free com- munication. In front a part of this ventral mesentery persists, binding the liver to the anterior abdominal wall, and in many ichthyopsida carrying the sub-intestinal vein to that organ. Another portion, known as the small omentum (or gastro-hepatic) and the duodeno-hepatic omentum extends from the dorsal surface of the liver to the stomach and duodenum (Fig. 11 3). The dorsal mesentery is usually far more complete.^ In it are recognize
. Text book of vertebrate zoology. Vertebrates; Anatomy, Comparative. MESOTHELIAL STRUCTURES. 105 break down, placing the coeloms of the two sides in free com- munication. In front a part of this ventral mesentery persists, binding the liver to the anterior abdominal wall, and in many ichthyopsida carrying the sub-intestinal vein to that organ. Another portion, known as the small omentum (or gastro-hepatic) and the duodeno-hepatic omentum extends from the dorsal surface of the liver to the stomach and duodenum (Fig. 11 3). The dorsal mesentery is usually far more complete.^ In it are recognized various regions, named according to the organs which they support, — mesogaster, mesentery proper, mesocolon,. Fig. 114. Three stages in the development of the alimentary canal and the mesenteries of man, after Toldt and Hertwig. a, appendix vermiformis; ao, aorta; b, bile duct; ^, caecum; co, colon; d, duodenum; go, great omentum; ?«c, meso- colon ; me, mesentery; mg, mesogaster; p, pancreas; r, rectum ; s, stomach ; si, small intestine ; sp, spleen ; tc, transverse colon; v, vitelline duct. The arrow points to the opening of the omentum. mesorectum, etc. It is attached to the dorsal wall in a straight line, and in those vertebrates with a straight alimentary canal the mesentery is a plane membrane, but with increasing con- volution of the alimentary canal, the membrane becomes corre- spondingly plaited. Besides this complication, the mesenteries can form secondary unions with the body wall, or with the 1 In Petromyzon. (cydostorae) it has entirely disappeared, except d few shreds in the rectal 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. New York, H. Holt and Company
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