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Figure 3: Schematic diagrams illustrating the development of retroaortic left innominate vein (RLIV) (a) In the sixth week of gestation: 1 - right anterior cardinal vein; 2 - left anterior cardinal vein; 3 - primitive aorta; 4 - superior transverse capillary plexus; 5 - inferior transverse capillary plexus; 6 - common cardinal veins; 7 - right posterior cardinal vein; 8 - left posterior cardinal vein; 9 - sinus venosus; 10 - vitelline vein; 11 - umbilical vein; 12 -developing inferior vena cava. (b) Retroaortic left innominate vein: 1 - innominate vein; 2 - azygos vein; 3 - superior vena cava; 4 - right atrium; 5 - inferior vena cava; 6 - coronary sinus; 7 - ascending aorta

Figure 3: Schematic diagrams illustrating the development of retroaortic left innominate vein (RLIV) (a) In the sixth week of gestation: 1 - right anterior cardinal vein; 2 - left anterior cardinal vein; 3 - primitive aorta; 4 - superior transverse capillary plexus; 5 - inferior transverse capillary plexus; 6 - common cardinal veins; 7 - right posterior cardinal vein; 8 - left posterior cardinal vein; 9 - sinus venosus; 10 - vitelline vein; 11 - umbilical vein; 12 -developing inferior vena cava. (b) Retroaortic left innominate vein: 1 - innominate vein; 2 - azygos vein; 3 - superior vena cava; 4 - right atrium; 5 - inferior vena cava; 6 - coronary sinus; 7 - ascending aorta