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CHAPTER 15 - LIVER AND GALLBLADDER
Histology Guide
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MICROGRAPH

NAME
EM 361 Portal Triad
TISSUE
Liver
(pig)
IMAGE SIZE
8,065 x 11,327 pixels
261 MB
FILE SIZES
37,851 KB (grayscale)
35,801 KB (color)
MAGNIFICATION
1,00x
PIXEL SIZE
21.17 nm
SOURCE
Pietro M. Motta
Department of Anatomy
University of Rome
Rome, Italy

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EM 361 Portal Triad

Portal Triad

Scanning electron microscopy (SEM) of a portal triad in the liver.

The following three vessels are bundled together and found at the corners of the hexagonally shaped hepatic lobules.

  • (red) - arteriole branch of the hepatic artery
    • Contains red blood cells (red)
    • Supplies oxygenated blood to hepatocytes
  • (blue) - venule branch of portal Vein
    • Scattered blood cells (red) attached to the endothelium
    • Supplies blood rich in nutrients and low in oxygen from the small intestine
  • (yellow) - small ducts that merge to form larger ducts of the biliary system
    • Simple cuboidal epithelium
    • Carry bile products away from hepatocytes

A continuous wall of hepatocytes surrounds the portal area.

The term “portal triad” is a bit of a misnomer because it implies only three components. In fact, it also contains lymphatic vessels and nerve fibers in this region.

Courtesy of Pietro M. Motta, Department of Anatomy, University of Rome, Rome, Italy.

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