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This designation, although arbitrary, seems
justified because of apparent functional
differences between this and the remaining
segments of the common bile duct, as will be
clarified later. Each pancreatic duct has several
smaller branching ducts. For example, the main
duct usually divides into two medium-sized ducts
in the tail region of the splenic lobe (Figs. 4 and
5). The splenic and duodenal ducts seem to
correspond to Santorini's and Wirsung’s ducts,
respectively 86, 92 .
Figure 5. Pancreatic ductal system
As in other mammals, the major blood supply of
the pancreas is provided by the splenic,
pancreaticoduodenal and right gastroepiploic
arteries (from the celiac artery) and a branch from
a superior mesenteric artery. Compared to
12
humans, however, the SGH has the following
specific pancreatic vascular patterns (Fig. 6)
1. The splenic artery runs through the splenic
lobe, generally delivers four branches to the
spleen, and forms the left gastroepiploic
artery.
2. This left gastroepiploic artery anastomoses
with the right gastroepiploic artery, which
supplies the gastric lobe through the long
artery within the fatty string (omental fat).
3. The right gastroepiploic artery is a branch of a
common artery that arises from the hepatic
artery. This common artery divides into two
branches while running through the body of
the splenic lobe. One branch leaves the
pancreas and runs along the greater curvature
of the glandular stomach to form the inferior
(right) gastric artery and the other extends
through the gastric lobe, as the right
gastroepiploic artery, and anastomoses with
the left gastroepiploic artery through the
omental fatty string. The cranial and caudal
pancreaticoduodenal arteries arising,
respectively, from the celiac and cranial
mesenteric arteries, supply the duodenal lobe
and head portions of the pancreas.
The venous blood supplies correspond to the
arterial patterns (Fig. 7). The splenic, right
gastroepiploic, and cranial pancreaticoduodenal
veins and the vein of the duodenal lobe empty
directly into the portal vein. A corresponding vein
anastomosis exists in the omental fatty string.
Figure 6. Patterns of pancreatic blood supply in the hamster.