Page 111 - Clinical Anatomy

ECA2 7/18/06 6:42 PM Page 96

96 The abdomen and pelvis

Fig. 72◊The morphological right and left lobes of the liver shown separated by the
dotted line: (a) anterior and (b) ventral aspect. Note that the quadrate lobe is
morphologically a part of the left lobe while the caudate lobe belongs to both right
and left lobes. (c) The further segmental divisions of the liver.

The right and left morphological lobes of the liver can be further subdi-
vided into a number of segments, four for each lobe (Fig. 72c). The student
need not learn the details of these, but of course to the hepatic surgeon, car-
rying out a partial resection of the liver, knowledge of these segments, with
their individual blood supply and biliary drainage, is of great importance.
At the hilum of the liver, the hepatic artery, portal vein and bile duct
each divide into right and left branches and there is little or no anastomosis
between the divisions on the two sides (Fig. 73). From the region of the
porta hepatis, the branches pass laterally and spread upwards and down-