Exact location and anatomical relationships of the pancreas show much variation among species. It is often attached to the spleen to form a slenopancreas. As in mammals the pancreas is both an exocrine and endocrine organ. In some genera, the islet tissue is formed into giant islets, rather than scattered randomly throughout the pancreatic exocrine tissue. | Exact location and anatomical relationships of the pancreas show much variation among species. It is often attached to the spleen to form a slenopancreas. As in mammals the pancreas is both an exocrine and endocrine organ. In some genera, the islet tissue is formed into giant islets, rather than scattered randomly throughout the pancreatic exocrine tissue. |