Final answer:
The fundus of the gallbladder is typically located beneath the posterior surface of the right lobe of the liver and serves as the widest part of the gallbladder, tapering into the body and neck for efficient bile storage and secretion.
Step-by-step explanation:
The fundus of the gallbladder is most often located in a shallow area on the posterior aspect of the right lobe of the liver. The gallbladder is a muscular sac that stores, concentrates, and propels bile into the duodenum via the common bile duct.
The fundus is known to be the widest part of the gallbladder, which then tapers into the body, and eventually narrows down to form the neck. This organization of the gallbladder ensures efficient bile storage and release during the digestion process when necessary, particularly for breaking down lipids in the duodenum.