The head of pancreas is a portion of the pancreas that is lodged within the curve of the duodenum, and is flattened anteriorly (from before). The other parts of the pancreas are the body and the tail. Its upper border is overlapped by the superior part of the duodenum and its lower overlaps the horizontal part; its right and left borders overlap in front, and insinuate themselves behind, the descending and ascending parts of the duodenum respectively. [WP,unvetted]. [ http://en.wikipedia.org/wiki/Head_of_pancreas ]