The gallbladder (or cholecyst or gall bladder) is a small non-vital organ that aids in the digestive process and stores bile produced in the liver. Human anatomy The gallbladder is a hollow organ that sits in a concavity of the liver known as the gallbladder fossa. In adults, the gallbladder measures approximately 8 cm in length and 4 cm in diameter when fully distended. It is divided into three sections: fundus, body, and neck. The neck tapers and connects to the biliary tree via the cystic du… (More on Gallbladder)