Poosystemic shunt is not sent in
At the liver, hepatic sinusoids& superior epigastric veins are forming poocaval anastomosis, at rectum superior rectal&middle, inferior rectal vein forms, at oesophagus between left gastric and azygos vein. Ref: Gray's 39e/p1026
Liverpool
Spleen
Anorectum
Gastrointestinal Esophageal
General anatomy