The =pancreas= is elongated, and is situated transversely on the dorsal
abdominal wall, with its right extremity on the ventral surface of the
right kidney, and the left end touching the dorsal end of the spleen and
the left kidney. The right portion has two lobes; the posterior lobe
bends around the great mesenteric artery and the portal vein; the
anterior one is pointed, extends downward and forward about in the
median plane, and is attached to the portal fissure and the duodenum.
The left portion is prismatic and rests mainly on the left sac of the
stomach, its left extremity being included between the left kidney and
the dorsal end of the spleen. The pancreatic =duct= passes from the
anterior lobe directly through the duodenal wall, opening about five or
six inches (ca. 12.5 to 15 cm.) from the pylorus. The interlobular
tissue usually contains a good deal of fat.