Difference between revisions of "Gall Bladder - Anatomy & Physiology"
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Revision as of 23:24, 2 July 2010
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Introduction
The gall bladder stores bile produced in the liver. Bile is important in the digestion of lipids.
The gall bladder forms as an outgrowth of the bile duct, as a secondary hollow at the posterior edge of the original hepatic rudiment. The gall bladder and the cyctic duct joins the common bile duct which enters the duodenum at the major duodenal papillae (with the pancreatic duct) on the dorsal surface of the duodenum
Structure
- Lies between the right medial and quadrate lobes of the liver
- Partly attached
- Partly free
Function
- Stores bile
- Concentrates bile by absorption through the folded mucosal wall
Innervation
- Parasympathetic nerves
Histology
- Highly folded mucosa
- Reduced submucosa
- No lamina muscularis
- Simple columnar epithelium
- No glands
Species Differences
Equine
- No gallbladder
Rodents
- No gallbladder in rats
Canine
- Lies opposite the 8th intercostal space
- Thinest layers of tunica muscularis
Bovine
- Thickest layers of tunica muscularis
- Sheep have a less projecting gall bladder than cows
- Gallbladder lies against the 10th or 11th rib
- Pigeons and parrots lack a gallbladder