Download MBBS Potosystemic Anastamoses Lecture PPT

PORTOSYSTEMIC
ANASTOMOSES

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PORTAL VEIN

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It provides 80% of blood that flow through liver
Collects blood from abdominal and pelvic part of the
alimentary tract, pancrease, spleen, gall bladder
It transports products of digestion like carbohydrates,
proteins from gut and products of RBC destruction

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from spleen

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FORMATION AND COURSE
Formed from superior mesenteric vein and splenic
vein at L2 level
Ascends upwards behind the neck of pancreas

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Ends at the right end of porta hepatis by dividing into
right and left branch
Inside the liver the blood is drained into hepatic
sinusoids from there drained by hepatic vein into IVC

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FORMATION

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TRIBUTERIES
Superior pancreaticoduodenal veins
Right gastric vein which is connected to the prepyloric
vein

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Left gastric vein connected to the oesophageal veins at
the lover end of oesophagus
Cystic vein
Paraumbilical veins that run along the ligamentum
teres

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PORTOSYSTEMIC ANASTOMOSES
These are anastomoses that occur between portal vein
and systemic venous system
It acts as collateral circulation in case of portal
obstruction

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SITES
UMBILICUS-Left gatric vein communicates with
superficial abdominal veins around the umbilicus
through paraumbilical veins.In Obstruction
superficial veins around umbilicus become tortuous

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and distented kown as caput medusae
LOWER END OF OESOPHAGUS-Oesophageal
tributaries of left gastric vein anastomose with
oesophageal tributaries of accessory hemiazygos vein

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ANAL CANAL-Superior rectal vein anastomoses with

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middle and inferior rectal veins, the tributaries of
internal iliac vein.
EXTRA PERITONEAL SURFACE OF
RETROPERITONAL ORGANS-Veins of
retroperitoneal organs such as duodenum, ascending

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colon, and descending colon anastomose with the
retroperitoneal veins of the posterior abdominal wall
and renal capsule
BARE AREA OF LIVER-Here the hepatic venules
anastomose with phrenic and intercostal veins.

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