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Arch Surg. 2001;136:146.

	Since this article does not have an abstract, we have provided the first 73 words of the full text and any section headings.

The valves of Heister are spiral folds of mucous membrane in the wall of the cystic duct. Their function is unknown; it is believed that they prevent sudden distention of the cystic duct when pressure in the gallbladder or cystic duct rises.

Hartmann's pouch is a sacculation of the neck of the gallbladder; it is a common site for gallstones to lodge in this pouch, also known as the infundibulum of the gallbladder.¹

1. Blackbourne LH, Fleischer KJ. Advanced Surgical Recall. Baltimore, Md: Williams & Wilkins; 1997:469.