Blood Vessels Of The Parenchyma

The blood vessels that occupy the portal canals are called interlobular vessels. Only the interlobular vessels that form the smallest portal triads send blood into the sinusoids. The larger interlobular vessels branch into distributing vessels that are located at the periphery of the lobule. These distributing vessels send inlet vessels to the sinusoids (Fig. 17.8). In the sinusoids, the blood flows centripetally toward the central vein. The central vein courses through the central axis of the classic liver lobule, becoming larger as it progresses through the lobule and empties into a sublobu-lar vein. Several sublobular veins converge to form larger hepatic veins that empty into the inferior vena cava.

The structure of the portal vein and its branches within the liver is typical of veins in general. The lumen is much larger than that of the artery associated with it. The structure of the hepatic artery is like that of other arteries, i.e., it has a thick muscular wall. In addition to providing arterial blood directly to the sinusoids, the hepatic artery provides arterial blood to the connective tissue and other structures in the larger portal canals. Capillaries in these portal vein portal vein

0 0

Post a comment