Differences of the ventral and dorsal anlagen of pancreas after fusion.

The distribution of the ventral pancreas after fusion was considered as a dorsal portion of the head containing the area surrounding the intrapancreatic view and by the distribution of "irregularly shaped islets". These special islets were not uniform in shape and contained few A, B, and D cells and many argyrophil cells with Grimelius stain. In some cases the ventral pancreas was identified macroscopically from the dorsal one by the presence of the smaller and closely packed lobuli. As for the differences of both anlagen, we emphasized "the irregularly shaped islets" and scantier fat in the ventral pancreas.