Portocaval (portosystemic) anastomosis is seen at all except -

Ans is 'd' i.e.. Duodenum Portocaval anastomosesSitePortalSystemicEsophagusEsophageal tributaries of left gastricHemizygousRectumSuperior rectalMiddle and inferior rectal ParaumbilicalAbove--superior epigastric and lateral thoracicRetroperitoneumSplenic, colicBelow--superficial epigastricSides--posterior intercostal and lumbarLeft renal and other tributaries of inferior venaBare area of liverPortal radicles of livercava (veins of Retzius)Diaphragmatic veinsFalciform ligamentParaumbilicalDiaphragmatic veins by an accessory portal system ofFissure for a Left branch of portal veinSappeyInferior vena cava via ductus venosusligamentum venosumPosterior vaginal wallSuperior rectalVaginal venous plexus