Origin: evagination of the wall of the foregut.
Location: postinferior surface of the liver.
Function: concentrates and stores bile.
Composition and function:
- Water - solute in which other components are cared.
- Cholesterol and phospholipids - metabolic substrates, precursors of membrane
components and steroids.
- Bile salts (acids) - emulsifying agents that aid in the digestion and absorption of
lipids from the gut.
- Bile pigments - detoxify bilirubin and carry it to the gut.
- Electrolytes - maintain bile as an isotonic fluid.
- The cystic duct connects the common hepatic duct and carries bile to and
out of the gallbladder. Distal to the junction the fused duct is called the common bile
duct and extends to the ampulla of Vater
on the duodenum. The thickening of the muscularis externa at the ampulla constitutes the sphincter
- The gallbladder is distensible pear-shaped sac.
Function: fluid and salt absorption.
Function: contraction and discharge of concentrated bile into duodenum.
Composition: randomly oriented bundles of smooth muscle cells with numerous collagen and elastic fibers.