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Fig. 194. Ventral reconstruction of the veins of the liver in a 4.9 mm human embryo


Soon, the proximal part of the left vitelline vein is largely absorbed into the hepatic sinusoids and shifts its blood flow to the right horn of the sinus venosus. Moreover, in 5 mm. embryos, the parallel vitelline veins communicate by three cross anastomoses (Figs. 194 and 195): (1) a cranial transverse connection in the liver, ventral to the duodenum; (2) a middle one, dorsal to the duodenum; and (3) a caudal one, ventral to it. There are thus formed about the gut a cranial and a caudal venous ring. A new vessel, the superior mesenteric, now develops in the mesentery of the intestinal loop and joins the left vitelline vein just caudal to its middle anastomosis (Fig. 195).

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   Developmental Anatomy 1924: 1 The Germ Cells and Fertilization | 2 Cleavage and the Origin of the Germ Layers | 3 Implantation and Fetal Membranes | 4 Age, Body Form and Growth Changes | 5 The Digestive System | 6 The Respiratory System | 7 The Mesenteries and Coelom | 8 The Urogenital System | 9 The Vascular System | 10 The Skeletal System | 11 The Muscular System | 12 The Integumentary System | 13 The Central Nervous System | 14 The Peripheral Nervous System | 15 The Sense Organs | C16 The Study of Chick Embryos | 17 The Study of Pig Embryos | Figures Leslie Arey.jpg


Arey LB. Developmental Anatomy. (1924) W.B. Saunders Company, Philadelphia.

Cite this page: Hill, M.A. (2024, April 24) Embryology Arey1924 fig194.jpg. Retrieved from

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