Questions and Answers
Couinaud's Classification divides the liver into ____ segments.
8
Each of the segments are _________ _________.
functionally independent
What are the intrasegmental vessels of each segment?
portal vein, hepatic artery, bile duct
What is the intersegmental vessel called in each segment?
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Portal veins are __________ and _________.
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Hepatic veins are ________ and _____________.
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What is the description of the liver segments based on?
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The _____, _______, and ________ ________ divide the liver longitudinally into four sections.
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What divides the liver sections transversely?
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What segments does the Couinaud system divide into superior and inferior subsegments?
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What vessels supply Segment 1?
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What vessels supply Segment 2?
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What vessels supply Segment 3?
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What vessels supply Segment 4a?
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What vessels supply Segment 4b?
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What vessels supply Segment 5?
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What vessels supply Segment 6?
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What vessels supply Segment 7?
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What vessels supply Segment 8?
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Study Notes
Couinaud Classification of the Liver
- Couinaud's Classification divides the liver into 8 segments.
- Each segment operates as a functionally independent unit.
Intrasegmental and Intersegmental Vessels
- Intrasegmental vessels for each segment include the portal vein, hepatic artery, and bile duct.
- The intersegmental vessel is the hepatic vein.
Portal and Hepatic Vein Characteristics
- Portal veins are considered intrasegmental and hepatopedal (flowing towards the liver).
- Hepatic veins are intersegmental and hepatofugal (flowing away from the liver).
Segment Description Basis
- Liver segments are described based on the portal and hepatic venous structures.
Divisions of the Liver
- The right, left, and middle hepatic veins longitudinally divide the liver into four sections.
- These sections are cross-divided by an invisible plane through the right and left portal veins.
Subsegmentation
- Couinaud's system further divides the left lateral, right anterior, and right posterior segments into superior and inferior subsegments while keeping the caudate lobe and medial left segment as single segments.
Segment Blood Supply
- Segment 1 (Caudate Lobe): Supplied by both right and left portal veins.
- Segment 2 (Left Lateral Superior): Supplied by the left portal vein.
- Segment 3 (Left Lateral Inferior): Supplied by the left portal vein.
- Segment 4a (Left Medial Superior): Supplied by the left portal vein.
- Segment 4b (Left Medial Inferior): Supplied by the left portal vein.
- Segment 5 (Right Anterior Inferior): Supplied by the right portal vein.
- Segment 6 (Right Posterior Inferior): Supplied by the right portal vein.
- Segment 7 (Right Posterior Superior): Supplied by the right portal vein.
- Segment 8 (Right Anterior Superior): Supplied by the right portal vein.
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Description
This quiz focuses on the Couinaud Classification, which divides the liver into eight functionally independent segments. Each segment has its own intrasegmental and intersegmental vessels including the portal vein, hepatic artery, and bile duct. Test your knowledge on this important anatomical classification.
