The gallbladder is a pear-shaped sac lying on the visceral surface of the right lobe of the liver in a fossa between the right and quadrate lobes .
It has:
a rounded end (fundus of gallbladder), which may project from the inferior border of the liver,
a major part in the fossa (body of gallbladder), which may be against the transverse colon and the superior part of the duodenum;
a narrow part (neck of gallbladder) with mucosal folds forming the spiral fold.

The gallbladder receives, concentrates, and stores bile from the liver.

Netter's Concise Atlas of Orthopaedic Anatomy