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Gallbladder Structure and Functiun

GASTROINTESTINAL PHYSIOLOGY

R. and L hepatic duets R. and L. hepatic arteries Common hepalic duet Cystic duet Propcr hepatic artery Common bile duc.l R. gastric artery

Gallbladder-microscopie section (hepatic side)

edge of anterior layer of lesser omentum

of gall-

Cystic duet Cystic duet (pars spiralis) ^^ars    gjght hepatic duet

Neck

gallbladder

Major papilla (of Vater)

hepatic duet

Common bile duet—microscopie section

4

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Ficure 7.33 Gallbladder Structure and Function

The gallbladder is a smali hollow organ attached to the surface of the hver. It serves to storę and concentrate the bile synthesized by the liver (holds about 20 to 50 ml of bile). Vagal stimulation and chole-cystokinin released from neuroendocrine cells in the duodenum (in response to the presence of fat) cause the gallbladder to contract and transport bile down the cystic duet and the common bile duet, where ii empties into the second (descending) portion of the duodenum. The gallbladder mucosa is specialized for electrolyte and water absorption, which allows the gallbladder to concentrate the bile.

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