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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 a portal triad, hepatocytes arranged in linear cords between a capillary network, and a central vein .
For these purposes, hepatocytes are usually isolated from animal or human [8] whole liver or liver tissue by collagenase digestion, which is a two-step process. In the first step, the liver is placed in an isotonic solution, in which calcium is removed to disrupt cell-cell tight junctions by the use of a calcium chelating agent.
In microanatomy, the central vein of liver (or central venule) [1] is a vein at the center of each hepatic lobule. [2] It receives the blood mixed in the liver sinusoids to drain it into hepatic veins .
Centrilobular necrosis (CN) is a nonspecific histopathological observation brought on by hepatotoxins like acetaminophen (paracetamol), [1] thioacetamide, tetrachloride, [2] cardiac hepatopathy due to acute right sided cardiac failure, and congestive hepatic injury in veno-occlusive disease, [3] or hypoxic injury due to ischemia. [2]
A liver segment is one of eight segments of the liver as described in the widely used Couinaud classification (named after Claude Couinaud) in the anatomy of the liver.This system divides the lobes of the liver into eight segments based on a transverse plane through the bifurcation of the main portal vein, [1] arranged in a clockwise manner starting from the caudate lobe.
The main liver cells are called hepatocytes; however, there are other cells that can be observed in a liver sample such as Kupffer cells (macrophages). [2] The liver is the biggest gland of the body. It has a wide variety of functions that range from the destruction of old blood cells to the control of the whole metabolism of macromolecules . [ 3 ]
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Congestive hepatopathy, is liver dysfunction due to venous congestion, usually due to congestive heart failure.The gross pathological appearance of a liver affected by chronic passive congestion is "speckled" like a grated nutmeg kernel; the dark spots represent the dilated and congested hepatic venules and small hepatic veins.