Venous drainage of GI tract

two venous systems of the abdomen

systemic/caval system, hepatic portal system

hepatic portal vein is formed by

splenic and superior mesenteric veins

veins of the foregut - what are they and where do they drain

right/left gastric v, splenic v drain to hepatic portal v

veins of the midgut drain to

superior mesenteric vein

veins of the hindgut drain to

inferior mesenteric vein

IMV may drain into

splenic or SMV

hepatic portal vein collects

venous return from the GI tract and brings it to the liver

venous return from GI tract is filtered by the liver and collected by

hepatic veins

hepatic veins drain into the

inferior vena cava

portal drainage

organs of digestion and spleen

the rest of the body drains via the

caval system

portocaval anastomoses

where two venous systems communicate - if there is portal hypertension the veins at these locations become varicose

esophageal anastomoses

left gastric v with esophageal v (azygous to SVC)

rectal anastomoses

superior rectal v with middle/inferior rectal v (to IVC)

paraumbilical anastomoses

paraumbilical v with superiorficial epigastric v (to IVC)

retroperitoneal anastomoses

colic v on ascending/descending colon with retroperitoneal v on posterior abd wall (to IVC)