Final answer:
After healing, the duodenum will have a distinctive feature known as the hepatopancreatic ampulla. This ampulla marks the transition from the anterior portion of the alimentary canal to the mid-region and is where the bile duct and main pancreatic duct join. The flow of both bile and pancreatic juice into the duodenum is regulated by the hepatopancreatic sphincter.
Step-by-step explanation:
The hepatopancreatic ampulla, also known as the Vater ampulla, is a characteristic feature of the duodenum that becomes evident after the healing of the duodenal wall. This ampulla connects the primary pancreatic duct and bile duct, and it signifies the change from the anterior to the mid-region of the alimentary canal. It enters the duodenum at the main duodenal papilla, a little structure resembling a volcano. The hepatopancreatic sphincter (sphincter of Oddi) controls the flow of pancreatic juice and bile from the ampulla into the duodenum.