A nodular organ in the Abdomen that contains a mixture of Endocrine Glands and EXOCRINE GLANDS. The small endocrine portion consists of the Islets of Langerhans secreting a number of Hormones into the Blood stream. The large exocrine portion (Exocrine Pancreas) is a compound acinar gland that secretes several digestive Enzymes into the pancreatic ductal system that empties into the Duodenum.