The terminal portion of the common bile duct and of the pancreatic duct of Wirsung.
D001652:Bile Ducts; D003135:Common Bile Duct / Q000033:anatomy & histology*; D006652:Histological Techniques; D006801:Humans; D010183:Pancreatic Ducts / Q000033:anatomy & histology*
BILE DUCT, COMMON/anatomy and histology; PANCREATIC DUCT/anatomy and histology