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Describe the location of the hepatic portal vein. Describe the routes of blood flow from the lesser curvature of the stomach,
cecum, transverse colon, ileum, sigmoid colon, spleen, and pancreas to the hepatic portal vein. Where does the blood go
alter entering the liver via the hepatic portal vein?

Respuesta :

Location,routes and function of hepatic portal vein is given below.

Explanation:

  • The hepatic portal vein is a vessel that moves blood from the spleen and gastrointestinal tract to the liver. It is approximately three to four inches in length and is usually formed by the merging of the superior mesenteric and splenic veins behind the upper edge of the head of the pancreas.Generally, the hepatic portal vein is about 8 centimeters (3 inches) long in adults, and is located in the upper right quadrant of the abdomen, which originates behind the neck of the pancreas and is part of the hepatic portal system.

  • The portal vein or hepatic portal vein is a blood vessel that carries blood from the gastrointestinal tract, gallbladder, pancreas and spleen to the liver.The portal system carries venous blood (rich in nutrients that have been extracted from food) to the liver for processing. The major vessel of the portal system is the portal vein. It is the point of convergence for the venous drainage of the spleen, pancreas, gallbladder and the abdominal part of the gastrointestinal tract. The portal vein is formed by the union of the splenic vein and the superior mesenteric vein, posterior to the neck of the pancreas, at the level of L2. As it ascends towards the liver, the portal vein passes posteriorly to the superior part of the duodenum and the bile duct. Immediately before entering the liver, the portal vein divides into right and left branches which then enter the parenchyma of the liver separately.

  • The portal vein and hepatic arteries form the liver's dual blood supply. Approximately 75% of hepatic blood flow is derived from the portal vein, while the remainder is from the hepatic arteries.Unlike most veins, the portal vein does not drain into the heart. Rather, it is part of a portal venous system that delivers venous blood into another capillary system, the hepatic sinusoids of the liver. In carrying venous blood from the gastrointestinal tract to the liver, the portal vein accomplishes two tasks: it supplies the liver with metabolic substrates and it ensures that substances ingested are first processed by the liver before reaching the systemic circulation. This accomplishes two things.  After draining into the liver sinusoids, blood from the liver is drained by the hepatic vein.