(or cholecyst, sometimes gall bladder) is a small organ
whose function in the body is to store bile
and aid in the digestive process.
The cystic duct connects the gall bladder to the common hepatic duct to form the common bile duct. This common bile duct then joins the pancreatic duct, and enters through the hepatopancreatic ampulla at the major duodenal papilla.
The fundus of the gallbladder is the part farthest from the duct, located by the lower border of the liver . It is at the same level as the transpyloric plane.
The different layers of the gallbladder are as follows:
The gallbladder stores about 50 mL (1.7 US fluid ounces
/ 1.8 Imperial fluid ounces) of bile
, which is released when food
containing fat enters the digestive tract
, stimulating the secretion
(CCK). The bile
, produced in the liver
, emulsifies fats and neutralizes acids in partly digested food.
After being stored in the gallbladder the bile becomes more concentrated than when it left the liver, increasing its potency and intensifying its effect on fats. Most digestion occurs in the duodenum.
Vertebrates have gallbladders, but invertebrates don't. This is because vertebrates eat in boluses while invertebrates are constantly eating. To digest a large bolus of food requires a large amount of digestive secretions, hence the presence of a gallbladder.
Diseases and disorders