PORTAL VEIN

PORTAL VEIN

This is formed by the union of several veins each of which drains blood from the area supplied by the corresponding artery .

·         The abdominal artery part of alimentary tract.

·         The gall bladder

·         The pancreas

·         The spleen and conveys it to the liver.

·         The portal vein breaks up into sinusoids which are drained by the hepatic veins into the inferior venecava.

·         Portal vein begins in one set of capillaries and ends in another set of capillaries.

·         The portal vein is about 8 cm long, it is formed by the union of superior mesenteric and splenic veins behind the neck of the pancreas.

·         The portal veins ends at the right end of the porta hepatis by dividing into right and left branches which enter the liver.

1.       The splenic vein ; it drains from the spleen, the pancreas and part of the stomach.

2.       The inferior mesenteric vein returns the venous blood from the small intestine and the proximal parts of the large intestine, i.e. the caecum,ascending and transverse colon.it unites with the splenic vein to form thr portal vein.

3.       The gastric veins drain from the stomach and the distal end of the oesophagus,then join the portal vein.

4.       The cystic vein, which drains venous blood from the gall bladder, joins the portal vein.