File:Arey1924 fig195.jpg

Fig. 195. The origin of the portal vein and ductus venosus as illustrated by a human embryo of 7 mm

modified after Wilhelm His (1831-1904).

In the liver, the portal vein, through its cranial anastomosis between the primitive vitelline veins, is connected with the left umbilical vein (Fig. 195). As the right lobe of the liver grows, the course of the umbilical and portal blood through the intrahepatic portion of the right vitelline vein becomes circuitous, and hence a new, direct channel to the sinus venosus is formed through the hepatic sinusoids. This is the ductus venosus (Fig. 195), which is obliterated after birth and forms the ligamentum venosum of the postnatal liver.

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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

Reference

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

Cite this page: Hill, M.A. (2024, April 18) Embryology Arey1924 fig195.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Arey1924_fig195.jpg

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