c l i n i c a l f o l i o s : n a r r a t i v e





A D V E R T I S E M E N T

 

Hepatic Segmental Anatomy - obsolete: 1

A D V E R T I S E M E N T

   
 

The portal structures of the liver, the bile duct, hepatic artery and portal vein, enter the hilum of the liver and branch to enter the center of each hepatic segment. The three sets of structures follow a common distribution pattern typified by the bile ducts (see also biliary and vascular variations). The primary branching into right and left hepatic ducts occurs in the liver hilum (10% of the time in the liver substance). The right duct bifurcates early into anterior and posterior segmental ducts. Not uncommonly, the two right segmental ducts form a trifurcation with the left hepatic duct. The left hepatic duct divides into medial and lateral segmental ducts. Each of the four major segmental ducts divides secondarily into superior and inferior branches. Small branches drain the caudate lobe into the proximal right and left hepatic ducts.   

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Hepatic Segmental Anatomy - obsolete: 2

A D V E R T I S E M E N T

   
 

The liver is divided into right and left lobes by a plane running through the gallbladder bed and inferior vena cava (pink plane). Each of the lobes is divided into two major segments (blue planes). The right lobe is divided into anterior and posterior segments and the left lobe is divided into medial and lateral segments. The three major hepatic veins lie in these planes between lobes and segments. Each of the four major segments is divided into a superior and inferior segment and the caudate lobe lies behind the superior part of the medial segment of the left lobe.     

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Hepatic Segmental Anatomy - obsolete: 3

A D V E R T I S E M E N T

   
 

The relationship of the segments, hepatic veins and portal structures can be seen in the caudal view. The right, middle and left hepatic veins lie in the major planes of division. The descriptive nomenclature of Healey and Schroy divides the right lobe into anterior and posterior segments, each with a superior and inferior division. The left lobe segments are called medial and lateral, also each having superior and inferior divisions. The caudate lobe lies behind the superior medial segment.     

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This page was last modified on 6/30/1999.