Duodenum and pancreas
The duodenum measures around 30cm and is the initial part of the small intestine, directly following the gastric pylorus. The head of the pancreas lays in the duodenal loop. The major duodenal papilla is the orifice of the excretory ducts of liver and pancreas, the common bile and the pancreatic duct. The pancreatic duct transports the exocrine secretions of the pancreas into the duodenum, whereas the endocrine part of the pancreas is the most important digestive gland because of its production of hormones like insulin and glucagon.