<prompt> Hepatopancreatic duct opens into:1st part of duodenum2nd part of duodenum3rd part of duodenum4th part of duodenum  <response>: Ans: b 2nd part of duodenum Ref: BDC, 4th ed, Vol. II, p. 248The 2nd part of the duodenum shows two special features:1 Major duodenal papilla: 8-10 cm from the pylorus, posteromediallyAmpulla of Vater- Major hepatopancreatic duct opens at its summit Duct of Wirsung2 Minor duodenal papilla: 6-8 cm from pylorusAccessory pancreatic duct opens at its summit Duct of SantoriniMore about the pancreatic and hepatopancreatic ducts:Pancreas- development- from dorsal and ventral bud Ventral bud - Lower part of head, uncinate process Dorsal bud - Upper part of head, body, tail Duct system:Main pancreatic duct -- Proximal part- ventral budDistal part- dorsal budAccessory pancreatic duct -- From dorsal bud proximal Islets of Langerhans -- derived from the primitive duct system The tributaries drain into the major pancreatic duct at right angles to its long axis, forming a Herring bone pattern 