Which liver lobes are most relevant in standard anatomy, and what is the flow of bile in the biliary tree to the duodenum?

• A. Left lobe only; flow not through common hepatic duct.
• B. Right lobe only; flow goes directly to the duodenum via the hepatic artery.
• C. Left and right lobes; bile flows from hepatocytes through canaliculi to bile ducts, then to the common hepatic duct and common bile duct, ultimately reaching the duodenum.
• D. Right and left lobes; bile is produced in the gallbladder and released directly into the duodenum.

Answer: (C)

In standard anatomy, bile is produced by hepatocytes across both the left and right liver lobes, so both lobes are relevant. From the hepatocytes, bile drains into tiny canaliculi, then into progressively larger intrahepatic ducts. These ducts merge to form the left and right hepatic ducts, which join to create the common hepatic duct. From there, bile has two main routes: it can flow into the cystic duct to be stored in the gallbladder, or continue as the common bile duct to the duodenum. When it reaches the duodenum, bile enters at the major duodenal papilla, passing through the sphincter of Oddi. If stored in the gallbladder, bile is released back into the biliary tree through the cystic duct when needed and then proceeds to the duodenum via the common bile duct.