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Fig. 212. The Mesentery of the Fore-gut and its Contents

Viewed from the left side (schematic).

At that time, the anterior wall of the yolk-sac and that part of the fore-gut which becomes the stomach, lie in the septum transversum (Figs. 211, 212). When the liver bud grows out, it springs from the junction of the fore-gut and yolk-sac (Fig. 221); and spreads into the ventral mesentery and septum transversum. The part of the gut from which it springs afterwards becomes the second stage of the duodenum It is at first a hollow diverticulum of the gut hypoblast (Fig. 218). The diverticulum is surrounded in the mesogastrium by a mass of mesoblastic cells which form the vessels, capsule and connective tissue of the liver. It divides almost at once into right and left solid processes of hypoblastic cells, to form the right and left lobes of the liver (Fig. 218.) The hepatic buds are developed just behind the sinus venosus and between the vitelline veins which are also situated in the ventral mesentery (Figs. 202 and 212). The veins are broken up by the ingrowth ; from them starts an invasion of venous capillaries, which, with the mesoblast of the septum transversum, penetrates the liver buds and breaks the solid processes of hypoblast into reticulating cylinders. Secondary processes start from the primary hepatic reticulating cylinders and form smaller and smaller meshes of hepatic cells. By the third month the hepatic lobules, with the intra- and sub-lobular arrangement of portal and hepatic veins, have appeared. The bile ducts probably represent the lumina of the original tubular hepatic buds. The umbilical veins also are cut by the hepatic invasion (Figs. 188 and 190).

Organs of Digestion: Fig. 212. Mesentery of the Fore-gut | Fig. 213 A. Liver Peritoneal Ligaments | Fig. 213 B. Liver Peritoneal Ligaments | Fig. 214. Mammalian Liver | Fig. 215. Liver of a human foetus 3rd month | Fig. 216. Embryo Spleen, Pancreas, and Liver to the Mesogastrium | Fig. 217. Mesogastrium | Fig. 218. Pancreatic and Hepatic Processes human embryo 4th week | Fig. 219. Arrangement of Vessels in the Dorsal week | Fig. 220. Formation of the Lesser Sac of the Peritoneum from the Dorsal Mesogastrium | Fig. 221. Alimentary Canal human embryo 3rd week | Fig. 222. Alimentary Canal 5th week | Fig. 223 A. The mesentery of the hind-gut | Fig. 223 B. descending Meso-colon becomes applied to the parietal Peritoneum | Fig. 224. Apex of the Caecum at birth | Fig. 225 A. Appendix and Peritoneal Folds 2nd month | Fig. 225 B. Peritoneal Fossae in the lleo-caecal Region | Fig. 226. Rotation of the Intestinal Loop



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Human Embryology and Morphology (1902): Development or the Face | The Nasal Cavities and Olfactory Structures | Development of the Pharynx and Neck | Development of the Organ of Hearing | Development and Morphology of the Teeth | The Skin and its Appendages | The Development of the Ovum of the Foetus from the Ovum of the Mother | The Manner in which a Connection is Established between the Foetus and Uterus | The Uro-genital System | Formation of the Pubo-femoral Region, Pelvic Floor and Fascia | The Spinal Column and Back | The Segmentation of the Body | The Cranium | Development of the Structures concerned in the Sense of Sight | The Brain and Spinal Cord | Development of the Circulatory System | The Respiratory System | The Organs of Digestion | The Body Wall, Ribs, and Sternum | The Limbs | Figures | Embryology History

Reference

Keith A. Human Embryology and Morphology. (1902) London: Edward Arnold.


Cite this page: Hill, M.A. (2024, April 24) Embryology Keith1902 fig212.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Keith1902_fig212.jpg

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