Gallbladder: Wikis

  

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Gallbladder
Abdomal organs.svg
Gallbladder is #5
Illu pancrease.svg
Diagram of Stomach
Latin vesica fellea
Gray's subject #250 1197
System Digestive system (GI Tract)
Artery Cystic artery
Vein Cystic vein
Nerve Celiac ganglia, vagus[1]
Precursor Foregut

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.

Contents

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.[2] It is divided into three sections: fundus, body, and neck. The neck tapers and connects to the biliary tree via the cystic duct, which then joins the common hepatic duct to become the common bile duct.

Microscopic anatomy

The different layers of the gallbladder are as follows:[3]

Function

The adult human gallbladder stores about 50 millilitres (1.8 imp fl oz; 1.7 US fl oz) of bile, which is released when food containing fat enters the digestive tract, stimulating the secretion of cholecystokinin (CCK). The bile, produced in the liver, emulsifies fats 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.

In other animals

Most vertebrates have gallbladders (exceptions include the horse, cervids, and the rat), whereas invertebrates do not. However, its precise form and the arrangement of the bile ducts may vary considerably. In many species, for example, there are several separate ducts running to the intestine, rather than a single common bile duct, as in humans. Several species of mammals and birds lack a gallbladder altogether, as do lampreys.[4]

See also

References

  1. ^ Ginsburg, Ph.D., J.N. (2005-08-22). "Control of Gastrointestinal Function". in Thomas M. Nosek, Ph.D.. Gastrointestinal Physiology. Essentials of Human Physiology. Augusta, Georgia, United State: Medical College of Georgia. pp. p. 30. http://www.lib.mcg.edu/edu/eshuphysio/program/section6/6ch2/6ch2line.htm. Retrieved 2007-06-29. 
  2. ^ Jon W. Meilstrup (1994). Imaging Atlas of the Normal Gallbladder and Its Variants. Boca Raton: CRC Press. pp. 4. ISBN 0-8493-4788-2. 
  3. ^ "Slide 5: Gall Bladder". JayDoc HistoWeb. University of Kansas. http://www.kumc.edu/instruction/medicine/anatomy/histoweb/epithel/epith05.htm. Retrieved 2007-06-29. 
  4. ^ Romer, Alfred Sherwood; Parsons, Thomas S. (1977). The Vertebrate Body. Philadelphia, PA: Holt-Saunders International. p. 355. ISBN 0-03-910284-X. 

External links


Simple English

The gallbladder is a pear-shaped organ in your abdomen that stores about 50 ml of acidic liquid (bile) until the body needs it for digestion. The gallbladder is about 7-10cm long in humans and is dark green in color because of the bile in it, not its tissue. It is connected to the liver and the duodenum by the biliary tract.








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