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Duodenum - Anatomy & Physiology (view source)
Revision as of 09:51, 11 July 2008
, 09:51, 11 July 2008no edit summary
**The bile duct and one of the pancreatic ducts discharge into the proximal part of the duodenum by separate ''major duodenal papillae''.
**The bile duct and one of the pancreatic ducts discharge into the proximal part of the duodenum by separate ''major duodenal papillae''.
**The second pancreatic duct discharges a little more distally on a smaller papilla.
**The second pancreatic duct discharges a little more distally on a smaller papilla.
==Function==
==Function==
*The cranial mesenteric vein drains blood from the duodenum into the portal vein.
*The cranial mesenteric vein drains blood from the duodenum into the portal vein.
**This blood, carrying the products of digestion, enters the liver.
**This blood, carrying the products of digestion, enters the liver.
==Species Differences==
===Canine===
*The duodenum is about 25cm long.
*The mesoduodenum is relatively long.
===Horse===
*Mesoduodenum is relatively short, so the duodenum is closely tethered in a constant position.
*The descending duodenum is attached to the base of the caecum.
*The descending duodenum runs caudally beneath the liver to the caudal pole of the right kidney where it has it's caudal flexure to become the ascending duodenum.
===Ruminant===
*Mesoduodenum is relatively short.
*The first part of the descending duodenum rises almost vertically within the ribcage, in close apposition to the liver.
**It turns level with the tuber coxae.
*The first part of the duodenum is attached to the liver by the lesser omentum.
*The descending duodenum also provides attachment for the superficial and deep sheets of the greater omentum.
===Pig===
*Small intestine is comparable to the dog.
*Mesoduodenum is relatively long.