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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