All of the following comprise the biliary tree EXCEPT?

The biliary tree is a network of ducts that transport bile from the liver to the duodenum. It includes several key structures: the left hepatic duct and the right hepatic duct, which collect bile from the corresponding lobes of the liver, and the common bile duct, which forms from the convergence of the left and right hepatic ducts and carries bile to the intestine.

The splenic duct, on the other hand, is not part of the biliary tree. It is associated with the spleen and primarily involved in the vascular system, draining blood from the spleen to the portal vein. Since it does not participate in the transport of bile or contribute to the biliary system, it is the correct choice that does not belong to the biliary tree. Understanding the specific anatomical roles of these structures is crucial for distinguishing between the components of the biliary system and other related vascular systems.