File:Keith1902 fig187.jpg

Fig. 187. The Left Vitelline Vein of an Embryo of the 4th week

The Portal Vein is formed out of the two vitelline veins — the first of all the veins to be developed. They end in the posterior chamber of the tubular heart of the embryo — the sinus venosus. The vitelline veins, right and left, arise from ramifications on the yolk sac and pass in the splanchnopleure to the sinus venosus (Fig. 187). The nutriment within the yolk sac is thus carried to the heart and distributed by the heart to the tissues of the embryo and yolk sac. The commencement of the left vitelline or omphalo-meseraic vein disappears. The right (Fig. 187) forms the superior mesenteric vein. It commences on the yolk sac, of which a remnant (the neck) may remain as Meckel's diverticulum.

The terminal parts of the two vitelline veins are joined by three transverse communications, the upper two of which are included in the portal vein. The uppermost of the three afterwards lies in the transverse fissure of the liver (Fig. 188). The middle communication lies on the dorsal aspect of the duodenum (Fig. 188). The splenic vein and inferior mesenteric pass in the dorsal mesentery (Fig. 187) and join this transverse communication which may be named the supra-duodenal junction. The third or lowest of the junctional trunks is situated on the ventral aspect of the duodenum (Fig. 188). Two parts may be recognised in the portal vein of the adult : (1) the part which lies behind the pancreas and duodenum ; (2) the part in the gastro-hepatic omentum and transverse fissure of the liver.

Circulatory System: Fig. 181. Adult Superior Vena Cava | Fig. 182. Embryonic Venous Trunks forming Superior Vena Cava | Fig. 183. Ducts of Cuvier | Fig. 184. Left Superior Vena Cava Remnants | Fig. 185. Sinus Venosus and Ducts of Cuvier 3rd week | Fig. 186. Posterior Cardinal Veins Remnants | Fig. 187. Left Vitelline Vein 4th week | Fig. 188. Diagram showing the Formation of the Ductus Venosus, and the fate of the Umbilical and Vitelline veins. The arrows show the parts of the Vitelline Veins which become the Portal Vein. | Fig. 189. Umbilical Vein Remnants | Fig.190. Right Umbilical Vein 3 weeks | Fig.191. Right and Left Cardiac Tubes | Fig.192. Fusion of Right and Left Cardiac Tubes | Fig.193. Dorsal and Ventral Mesocardia | Fig.194. Primitive Heart Divisions | Fig.195. Heart Bends 3rd week | Fig.196. Sinus Venosus | Fig.197. Heart 5th week | Fig.198. Heart Septa | Fig.199. Fetal Heart Ventricles | Fig 200. Semilunar valves | Fig 201. Embryo Coelom 3rd week | Fig. 202 Heart Arterial and Venous Mesocardia week 3 | Figures

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Reference

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

Cite this page: Hill, M.A. (2024, April 27) Embryology Keith1902 fig187.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Keith1902_fig187.jpg

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