GI Radiology > Liver > Anatomy > Subsegments

Liver Anatomy

How to remember the subsegments?

  • Step 1: Remember that number 1 is caudate lobe
  • Step 2: Draw a rectangle and divide it into eight boxes like below:

  • Step 3: Then, start from the rightmost upper box and label "2" and proceed clockwise in increasing numerical order.  When you come to number 4, you should count out loud "4A and 4B" and then move on to 5, 6, 7, 8...

  • Step 4: Study the hepatic vasculatures below.  These vessels will help you divide the liver into segments.

  • Step 5: Study the superimposed image below.  Note that the four upper boxes are separated by left, middle, and right hepatic veins.  In the four lower boxes, note that the right anterior portal vein goes into box 5 whereas the right posterior portal vein goes into box 6.  Box 5 and 4b are separated by the gall bladder.  Box 4b and box 3 are separated by ligamentum teres and falciform ligament (not shown).


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