Hartmann’s pouch is an out-pouching of the wall of the gallbladder

Gallbladder

In vertebrates the gallbladder is a small organ that aids mainly in fat digestion and concentrates bile produced by the liver. In humans the loss of the gallbladder is usually easily tolerated....

 at the junction of the neck of the gallbladder and the cystic duct

Cystic duct

The cystic duct is the short duct that joins the gall bladder to the common bile duct. It usually lies next to the cystic artery. It is of variable length...

. Its identification is useful in delineating biliary anatomy when performing a cholecystectomy

Cholecystectomy

Cholecystectomy is the surgical removal of the gallbladder. It is the most common method for treating symptomatic gallstones. Surgical options include the standard procedure, called laparoscopic cholecystectomy, and an older more invasive procedure, called open cholecystectomy.-Open surgery:A...

.

It is named after Henri Albert Hartmann

Henri Albert Hartmann

Henri Albert Hartmann was a French surgeon. He wrote numerous papers on a wide variety of subjects, ranging from war injuries to shoulder dislocations to gastrointestinal cancer...

 who first described it.

Sometimes the term "Hartmann's pouch" is used to describe "Hartmann's procedure" which refers to a colon or rectal resection without an anastomosis in which a colostomy or ileostomy is created and the distal colon or rectum is left as a blind pouch.

Clinical significance
Impaction of gallstones in the Hartmann's pouch leads to Mucocoele of Gall Bladder.