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In histology (microscopic anatomy), the lobules of liver, or hepatic lobules, are small divisions of the liver defined at the microscopic scale. The hepatic lobule is a building block of the liver tissue , consisting of portal triads, hepatocytes arranged in linear cords between a capillary network, and a central vein .
Liver cirrhosis can lead to increased intrahepatic vascular resistance and vasodilation of portal system arteries, both of which increase pressure in the portal vein. [4] Color Doppler Ultrasound is the most useful imaging tool used to identify aneurysms, thrombosis, and branching patterns of the portal venous system, and to determine if ...
The right vertical limb of the "H" defines the left and right functional lobes, while the left vertical limb of the "H" defines the right and left anatomical lobes. The horizontal line between the vertical limbs of the "H" represents the porta hepatis. The quadrate and caudate lobe lie superior and inferior to this line respectively.
The quadrate lobe is an area of the liver situated on the undersurface of the medial segment left lobe (Couinaud segment IVb), bounded in front by the anterior margin of the liver, behind by the porta hepatis, on the right by the fossa for the gall-bladder, and on the left by the fossa for the umbilical vein.
It is formed by the union of the right hepatic duct (which drains bile from the right functional lobe of the liver) and the left hepatic duct (which drains bile from the left functional lobe of the liver). [3] The duct is about 3 cm long. [4] The common hepatic duct is about 6 mm in diameter in adults, with some variation. [5]
Polycystic liver disease (PLD) usually describes the presence of multiple cysts scattered throughout normal liver tissue. [1] PLD is commonly seen in association with autosomal-dominant polycystic kidney disease , with a prevalence of 1 in 400 to 1000, and accounts for 8–10% of all cases of end-stage renal disease . [ 2 ]
The cystohepatic triangle (or hepatobiliary triangle or Calot's triangle) is an anatomic space bordered by the cystic duct laterally, the common hepatic duct medially, and the inferior surface of the liver superiorly. Cystohepatic triangle, marked with green. The cystic artery lies within the hepatobiliary triangle.
In the developed world, the most common cause is liver cirrhosis. [4] Other causes include cancer, heart failure, tuberculosis, pancreatitis, and blockage of the hepatic vein. [4] In cirrhosis, the underlying mechanism involves high blood pressure in the portal system and dysfunction of blood vessels. [4]