Histologically, the liver is divided into lobules.
This is the junction of several lobules. The lobule filling the right side of the frame has its central vein at the bottom right of the frame..
Here we are within another liver lobule, so we cannot see the edges of the lobule, only the central vein. This example shows how the liver cells or hepatocytes tend to form plates or layers, with spaces or sinusoids between them.