Gallbladder - Wikipedia Gallbladder This is the latest accepted revision, reviewed on 19 December 2017. Gallbladder The gallbladder sits beneath the liver. Details Precursor Foregut System Digestive system Artery Cystic artery Vein Cystic vein Nerve Celiac ganglia, Vagus nerve Identifiers Latin Vesica biliaris, vesica fellea MeSH A03. 159.439 Dorlands / Elsevier 12383343 TA A05. 8.02. 001 FMA 7202 Anatomical terminology ( edit on Wikidata ) In vertebrates, the gallbladder is a small hollow organ where bile is stored and concentrated before it is released into the small intestine. In humans, the pear - shaped gallbladder lies beneath the liver, although the structure and position of the gallbladder can vary significantly among animal species. It receives and stores bile, produced by the liver, via the common hepatic duct, and releases it via the common bile duct into the duodenum, where the bile helps in the digestion of fats. The gallbladder can be affected by gallstones, formed by material that can not be dissolved -- usually cholesterol or bilirubin, a product of haemoglobin breakdown. These may cause significant pain, particularly in the right upper corner of the abdomen, and are often treated with removal of the gallbladder called a cholecystectomy. Cholecystitis, inflammation of the gallbladder, has a wide range of causes, including result from the impaction of gallstones, infection, and autoimmune disease. Contents 1 Structure 1.1 Microanatomy 1.2 Variation 1.3 Development 2 Function 3 Clinical significance 3.1 Gallstones 3.2 Inflammation 3.3 Gallbladder removal 3.4 Cancer 3.5 Tests 4 Society and culture 5 Other animals 6 History 7 See also 8 References 9 External links Structure The gallbladder is a hollow organ that sits in a shallow depression below the right lobe of the liver, that is grey - blue in life. In adults, the gallbladder measures approximately 7 to 10 centimetres ( 2.8 to 3.9 inches ) in length and 4 centimetres ( 1.6 in ) in diameter when fully distended. The gallbladder has a capacity of about 50 millilitres ( 1.8 imperial fluid ounces ). The gallbladder is shaped like a pear, with its tip opening into the cystic duct. The gallbladder is divided into three sections : the fundus, body, and neck. The fundus is the rounded base, angled so that it faces the abdominal wall. The body lies in a depression in the surface of the lower liver. The neck tapers and is continuous with the cystic duct, part of the biliary tree. The gallbladder fossa, against which the fundus and body of the gallbladder lie, is found beneath the junction of hepatic segments IVB and V. The cystic duct unites with the common hepatic duct to become the common bile duct. At the junction of the neck of the gallbladder and the cystic duct, there is an out - pouching of the gallbladder wall forming a mucosal fold known as `` Hartmann 's pouch ''. Microanatomy Micrograph of a normal gallbladder wall. H&E stain. The gallbladder wall is composed of a number of layers. The gallbladder wall 's innermost surface is lined by a single layer of columnar cells with a brush border of microvilli, very similar to intestinal absorptive cells. Underneath the epithelium is an underlying lamina propria, a muscular layer, an outer perimuscular layer and serosa. Unlike elsewhere in the intestinal tract, the gallbladder does not have a muscularis mucosae, and the muscular fibres are not arranged in distinct layers. The mucosa, the inner portion of the gallbladder wall, consists of a lining of a single layer of columnar cells, with cells possessing small hair - like attachments called microvilli. This sits on a thin layer of connective tissue, the lamina propria. The mucosa is curved and collected into tiny outpouchings called rugae. A muscular layer sits beneath the mucosa. This is formed by smooth muscle, with fibres that lie in longitudinal, oblique and transverse directions, and are not arranged in separate layers. The muscle fibres here contract to expel bile from the gallbladder. A distinctive feature of the gallbladder is the presence of Rokitansky -- Aschoff sinuses, deep outpouchings of the mucosa that can extend through the muscular layer. The muscular layer is surrounded by a layer of connective and fat tissue. The outer layer of the fundus of gallbladder, and the surfaces not in contact with the liver, are covered by a thick serosa, which is exposed to the peritoneum. The serosa contains blood vessels and lymphatics. The surfaces in contact with the liver are covered in connective tissue. Variation The gallbladder varies in size, shape, and position between different people. Rarely, two or even three gallbladders may coexist, either as separate bladders draining into the cystic duct, or sharing a common branch that drains into the cystic duct. Additionally, the gallbladder may fail to form at all. Gallbladders with two lobes separated by a septum may also exist. These abnormalities are not likely to affect function and are generally asymptomatic. The location of the gallbladder in relation to the liver may also vary, with documented variants including gallbladders found within, above, on the left side of, behind, and detached or suspended from the liver. Such variants are very rare : from 1886 to 1998, only 110 cases of left - lying liver, or less than one per year, were reported in scientific literature. An anatomical variation can occur, known as a Phrygian cap, which is an innocuous fold in the fundus, named after its resemblance to the Phrygian cap. Development The gallbladder develops from an endodermal outpouching of the embryonic gut tube. Early in development, the human embryo has three germ layers and abuts an embryonic yolk sac. During the second week of embryogenesis, as the embryo grows, it begins to surround and envelop portions of this sac. The enveloped portions form the basis for the adult gastrointestinal tract. Sections of this foregut begin to differentiate into the organs of the gastrointestinal tract, such as the esophagus, stomach, and intestines. During the fourth week of embryological development, the stomach rotates. The stomach, originally lying in the midline of the embryo, rotates so that its body is on the left. This rotation also affects the part of the gastrointestinal tube immediately below the stomach, which will go on to become the duodenum. By the end of the fourth week, the developing duodenum begins to spout a small outpouching on its right side, the hepatic diverticulum, which will go on to become the biliary tree. Just below this is a second outpouching, known as the cystic diverticulum, that will eventually develop into the gallbladder. Function 1. Bile ducts : 2. Intrahepatic bile ducts, 3. Left and right hepatic ducts, 4. Common hepatic duct, 5. Cystic duct, 6. Common bile duct, 7. Ampulla of Vater, 8. Major duodenal papilla 9. Gallbladder, 10 -- 11. Right and left lobes of liver. 12. Spleen. 13. Esophagus. 14. Stomach. 15. Pancreas : 16. Accessory pancreatic duct, 17. Pancreatic duct. 18. Small intestine : 19. Duodenum, 20. Jejunum 21 -- 22. Right and left kidneys. The front border of the liver has been lifted up ( brown arrow ). The main purpose of the gallbladder is to store bile, also called gall, needed for the digestion of fats in food. Produced by the liver, bile flows through small vessels into the larger hepatic ducts and ultimately though the cystic duct ( parts of the biliary tree ) into the gallbladder, where it is stored. At any one time, 30 to 60 millilitres ( 1.0 to 2.0 US fl oz ) of bile is stored within the gallbladder. When food containing fat enters the digestive tract, it stimulates the secretion of cholecystokinin ( CCK ) from I cells of the duodenum and jejunum. In response to cholecystokinin, the gallbladder rhythmically contracts and releases its contents into the common bile duct, eventually draining into the duodenum. The bile emulsifies fats in partly digested food, thereby assisting their absorption. Bile consists primarily of water and bile salts, and also acts as a means of eliminating bilirubin, a product of hemoglobin metabolism, from the body. The bile that is secreted by the liver and stored in the gallbladder is not the same as the bile that is secreted by the gallbladder. During gallbladder storage of bile, it is concentrated by removal of some water and electrolytes. This is through the active transport of sodium ions across the epithelium of the gallbladder, which creates an osmotic pressure that also causes water and other electrolytes such as chloride to be reabsorbed. Clinical significance Main article : Gallbladder disease Gallstones Main article : Gallstones Gallstones form when the bile is saturated, usually with either cholesterol or bilirubin. Most gallstones do not cause symptoms, with stones either remaining in the gallbladder or passed along the biliary system. When symptoms occur, severe `` colicky '' pain in the upper right part of the abdomen is often felt. If the stone blocks the gallbladder, inflammation known as cholecystitis may result. If the stone lodges in the biliary system, jaundice may occur ; and if the stone blocks the pancreatic duct, then pancreatitis may occur. Gallstones are diagnosed using ultrasound. When a symptomatic gallstone occurs, it is often managed by waiting it to be passed naturally. Given the likelihood of recurrent gallstones, surgery to remove the gallbladder is often considered. Some medication, such as ursodeoxycholic acid, may be used ; and lithotripsy, a procedure used to break down the stones, may also be used. Inflammation Main article : Cholecystitis Known as cholecystitis, inflammation of the gallbladder is commonly caused by obstruction of the duct with gallstones, which is known as cholelithiasis. Blocked bile accumulates, and pressure on the gallbladder wall may lead to the release of substances that cause inflammation, such as phospholipase. There is also the risk of bacterial infection. An inflamed gallbladder is likely to cause pain and fever, and tenderness in the upper, right corner of the abdomen, and may have a positive Murphy 's sign. Cholecystitis is often managed with rest and antibiotics, particularly cephalosporins and, in severe cases, metronidazole. Gallbladder removal Main article : Cholecystectomy A cholecystectomy is a procedure in which the gallbladder is removed. It may be removed because of recurrent gallstones, and is considered an elective procedure. A cholecystectomy may be an open procedure, or one conducted by laparoscopy. In the surgery, the gallbladder is removed from the neck to the fundus, and so bile will drain directly from the liver into the biliary tree. About 30 percent of patients may experience some degree of indigestion following the procedure, although severe complications are much rarer. About 10 percent of surgeries lead to a chronic condition of postcholecystectomy syndrome. Cancer Main article : Gallbladder carcinoma Cancer of the gallbladder is uncommon and mostly occurs in later life. When cancer occurs, it is mostly of the glands lining the surface of the gallbladder ( adenocarcinoma ). Gallstones are thought to be linked to the formation of cancer, and other risk factors include large ( > 1 cm ) gallbladder polyps and having a highly calcified `` porcelain '' gallbladder. Cancer of the gallbladder can causes attacks of biliary pain, yellowing of the skin ( jaundice ), and weight loss. A large gallbladder may be able to felt in the abdomen. Liver function tests may be elevated, particularly involving GGT and ALP, with ultrasound and CT scans being considered medical imaging investigations of choice. Cancer of the gallbladder is managed by removing the gallbladder, however As of 2010 the prognosis remains poor. Cancer of the gallbladder may also be found incidentally after surgical removal of the gallbladder, with 1 - 3 % of cancers identified in this way. Gallbladder polyps are mostly benign growths or lesions resembling growths that form in the gallbladder wall, and are only associated with cancer when they are larger in size ( > 1 cm ). Cholesterol polyps, often associated with cholesterolosis ( `` strawberry gallbladder '', a change in the gallbladder wall due to excess cholesterol. ) Such polyps often cause no symptoms and so are often detected in this way. Tests An ultrasound showing the gallbladder ( central dark area ) with a large gallstone ( white circular area found near the middle ). Tests used to investigate for gallbladder disease include blood tests and medical imaging. A full blood count may reveal an increased white cell count suggestive of inflammation or infection. Tests such as bilirubin and liver function tests may reveal if there is inflammation linked to the biliary tree or gallbladder, and whether this is associated with inflammation of the liver, and a lipase or amylase may be elvated if there is pancreatitis. Bilirubin may rise when there is obstruction of the flow of bile. A CA 19 - 9 level may be taken to investigate for cholangiocarcinoma. Ultrasound is often the first medical imaging test performed when gallbladder disease such as gallstones are suspected. An abdominal X-ray or CT scan is another form of imaging that may be used to examine the gallbladder and surrounding organs. Other imaging options include MRCP ( magnetic resonance cholangiopancreatography ), ERCP and percutaneous or intraoperative cholangiography. A cholescintigraphy scan is a nuclear imaging procedure used to assess the condition of the gallbladder. Society and Culture To have ' gall ' is associated with bold behaviour, whereas to have ' bile ' is associated with bitterness. In the Chinese language, the gallbladder ( Chinese : 膽 ) is associated with courage and a myriad of related idioms, including using terms such as `` a body completely ( of ) gall '' ( Chinese : 渾身 是 膽 ) to describe a brave person, and `` single gallbladder hero '' ( Chinese : 孤膽 英雄 ) to describe a lone hero. In the Zangfu theory of Chinese medicine, the gallbladder not only has a digestive role, but is seen as the seat of decision - making. Other animals Most vertebrates have gallbladders, but the form and arrangement of the bile ducts may vary considerably. In many species, for example, there are several separate ducts running to the intestine, rather than the single common bile duct found in humans. Several species of mammals ( including horses, deer, rats, and laminoids ), several species of birds, lampreys and all invertebrates lack a gallbladder altogether. The bile from several species of bears is used in Traditional Chinese medicine ; bile bears are kept alive in captivity while their bile is painfully extracted, in an industry characterized by animal cruelty. History Depictions of the gallbladder and biliary tree are found in Babylonian models found from 2000 BCE, and in ancient Etruscan model from 200 BCE, with models associated with divine worship. Diseases of the gallbladder have affected humans since antiquity, with gallstones found in the mummy of Princess Amenen of Thebes dating to 1500 BCE. Some historians believe the death of Alexander the Great may have been associated with an acute episode of cholecystitis. The existence of the gallbladder has been noted since the 5th century, but it is only relatively recently that the function and the diseases of the gallbladder has been documented, particularly in the last two centuries. The first descriptions of gallstones appear to have been in the Renaissance, perhaps because of the low incidence of gallstones in earlier times owing to a diet with more cereals and vegetables, and less meat. Anthonius Benevinius in 1506 was the first to draw a connection between symptoms and the presence of gallstones. Courvoisier after examining a number of cases in 1890 that gave rise to the eponymous Courvoisier 's law stating that in an enlarged, nontender gallbladder, the cause of jaundice is unlikely to be gallstones. The first surgical removal of a gallstone ( cholecystolithotomy ) was in 1676 by physician Joenisius, who removed the stones from a spontaneously occurring biliary fistula. Stough Hobbs in 1867 performed the first recorded cholecystotomy, although such an operation was in fact described earlier by French surgeon Jean Louis Petit in the mid eighteenth century. German surgeon Carl Langenbuch performed the first cholecystectomy in 1882 for a sufferer of cholelithiasis. Before this, surgery had focused on creating a fistula for drainage of gallstones. Langenbuch reasoned that given several other species of mammal has no gallbladder, humans could survive without one. The debate whether surgical removal of the gallbladder or simply gallstones was preferred was settled in the 1920s, with consensus that removal of the gallbladder was preferred. It was only in the mid and late parts of the twentieth century that medical imaging techniques such as use of contrast medium and CT scans were used to view the gallbladder. The first laparoscopic cholecystectomy performed by Erich Mühe of Germany in 1985, although French surgeons Phillipe Mouret and Francois Dubois are often credited for their operations in 1987 and 1988 respectively. See also Medicine portal Enterohepatic circulation References Jump up ^ Ginsburg, Ph. D., J.N. ( August 22, 2005 ). `` 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. Archived from the original on April 1, 2008. 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( link ) CS1 maint : Multiple names : authors list ( link ) CS1 maint : Extra text : authors list ( link ) ^ Jump up to : Hall, Arthur C. Guyton, John E. ( 2005 ). Textbook of medical physiology ( 11th ed. ). Philadelphia : W.B. Saunders. pp. 802 -- 804. ISBN 978 - 0 - 7216 - 0240 - 0. ^ Jump up to : `` Cholelithiasis - Hepatic and Biliary Disorders - MSD Manual Professional Edition ''. MSD Manual Professional Edition. Retrieved 18 October 2017. ^ Jump up to : Britton, the editors Nicki R. Colledge, Brian R. Walker, Stuart H. Ralston ; illustrated by Robert ( 2010 ). Davidson 's principles and practice of medicine ( 21st ed. ). Edinburgh : Churchill Livingstone / Elsevier. pp. 977 -- 984. ISBN 978 - 0 - 7020 - 3085 - 7. Jump up ^ Neri V ; Ambrosi A ; Fersini A ; Tartaglia N ; Valentino TP ( 2007 ). `` Antegrade dissection in laparoscopic cholecystectomy ''. JSLS : Journal of the Society of Laparoendoscopic Surgeons / Society of Laparoendoscopic Surgeons. 11 ( 2 ) : 225 -- 8. PMC 3015719. PMID 17761085. Jump up ^ nhs.uk, Complications of a gallbladder removal Jump up ^ `` Gallbladder Polyps ''. MayoClinic. Retrieved March 19, 2015. Jump up ^ Strawberry gallbladder -- cancerweb.ncl.ac.uk. Jump up ^ `` HIDA scan - Overview ''. Mayo Clinic. Retrieved 18 October 2017. Jump up ^ J.A. Simpson ( 1989 ). The Oxford English dictionary ( 2nd ed. ). Oxford : Clarendon Press. gall, bile. ISBN 978 - 0 - 19 - 861186 - 8. ^ Jump up to : Yu, Ning ( January 1, 2003 ). `` Metaphor, Body, and Culture : The Chinese Understanding of Gallbladder and Courage ''. Metaphor and Symbol. 18 ( 1 ) : 13 -- 31. doi : 10.1207 / S15327868MS1801_2. Jump up ^ C. Michael Hogan. 2008. Guanaco : Lama guanicoe, GlobalTwitcher.com, ed. N. Strömberg Archived March 4, 2011, at the Wayback Machine. Jump up ^ Higashiyama, H ; Sumitomo, H ; Ozawa, A ; Igarashi, H ; Tsunekawa, N ; Kurohmaru, M ; Kanai, Y ( 2016 ). `` Anatomy of the Murine Hepatobiliary System : A Whole - Organ - Level Analysis Using a Transparency Method ''. The Anatomical Record. 299 ( 2 ) : 161 -- 172. doi : 10.1002 / ar. 23287. PMID 26559382. Jump up ^ Romer, Alfred Sherwood ; Parsons, Thomas S. ( 1977 ). The Vertebrate Body. Philadelphia, PA : Holt - Saunders International. p. 355. ISBN 0 - 03 - 910284 - X. Jump up ^ Actman, Jani ( 5 May 2016 ). `` Inside the Disturbing World of Bear - Bile Farming ''. National Geographic. Retrieved 23 October 2017. Jump up ^ Hance, Jeremy ( 9 April 2015 ). `` Is the end of ' house of horror ' bear bile factories in sight ? ''. The Guardian. Retrieved 23 October 2017. ^ Jump up to : Eachempati, Soumitra R. ; II, R. Lawrence Reed ( 2015 ). Acute Cholecystitis. Springer. pp. 1 -- 16. ISBN 9783319148243. ^ Jump up to : Jarnagin, William R. ( 2012 ). Blumgart 's Surgery of the Liver, Pancreas and Biliary Tract E-Book : Expert Consult - Online. Elsevier Health Sciences. p. 511. ISBN 1455746061. ^ Jump up to : Bateson, M.C. ( 2012 ). Gallstone Disease and its Management. Springer Science & Business Media. pp. 1 -- 2. ISBN 9789400941731. Jump up ^ Reynolds, Walker ( January -- March 2001 ). `` The First Laparoscopic Cholecystectomy ''. Journal of the Society of Laparoendoscopic surgeons. 5 ( 1 ) : 89 -- 94. Books editor - in - chief, Susan Standring ; section editors, Neil R. Borley ; et al. ( 2008 ). Gray 's anatomy : the anatomical basis of clinical practice ( 40th ed. ). London : Churchill Livingstone. ISBN 978 - 0 - 8089 - 2371 - 8. CS1 maint : Explicit use of et al. ( link ) CS1 maint : Multiple names : authors list ( link ) CS1 maint : Extra text : authors list ( link ) External links Wikimedia Commons has media related to Gallbladder. Diagram of Human Stomach and Gallbladder -- Human Anatomy Online dd, MyHealthScore.com. Anatomy of the liver, pancreas and biliary tree Liver Bare area Cantlie line Ligamentum venosum Porta hepatis Round ligament Lobes of liver Caudate Quadrate Fibrous capsule of Glisson Perisinusoidal space Liver sinusoid Periportal space Portal triad Lobules of liver Liver segment Microanatomy Hepatocyte Hepatic stellate cell Kupffer cell Biliary tract Bile ducts Intrahepatic bile ducts Bile canaliculus Canals of Hering Interlobular Left hepatic duct Right hepatic duct Common hepatic duct Gallbladder Cystic duct Common bile duct Ampulla of Vater Sphincter of Oddi Cells Cholecystocyte Pancreas Gross Tail Body Neck Head ( Uncinate process ) Ducts main accessory Microanatomy Pancreatic islets Centroacinar cell Stellate cell GND : 4071544 - 9 NDL : 00572670 Retrieved from `` https://en.wikipedia.org/w/index.php?title=Gallbladder&oldid=816138449 '' Categories : Abdomen Animal anatomy Gallbladder Organs ( anatomy ) Hidden categories : CS1 maint : Explicit use of et al. 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Question: where is the gallbladder situated in our body
Answer: beneath the liver