Poo-caval anastomosis is seen between:
A i.e. In the rectum - superior rectal vein & inferior rectal vein
In the rectum: superior rectal vein and inferior rectal vein
At the umbilicus: poal vein and accessory hemiazyogs vein
At the esophagus: left gastric vein and paraumbilical vein
At the liver: poal vein & renal azygos vein