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Duodenum - Anatomy & Physiology (view source)
Revision as of 08:12, 11 July 2008
, 08:12, 11 July 2008no edit summary
<big><center>[[Alimentary - Anatomy & Physiology|'''BACK TO ALIMENTARY - ANATOMY & PHYSIOLOGY''']]</center></big>
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<big><center>[[Small Intestine - Anatomy & Physiology|'''BACK TO SMALL INTESTINE - ANATOMY AND PHYSIOLOGY]]</center></big>
<big><center>[[Small Intestine - Anatomy & Physiology|'''BACK TO SMALL INTESTINE - ANATOMY AND PHYSIOLOGY]]</center></big>
==Structure==
==Structure==
*The duodenum is the proximal part of the small intestine and extends from the pylorus of the stomach to the jejunum.
*It has a sigmoid flexure upon leaving the stomach.
*It has descending and ascending portions.
*It has descending and ascending portions.
**The descending duodenum passes out of the pylorus of the stomach (on the right side of the abdomen) and has a sigmoid flexure. It passes towards the right abdominal wall and rises dorsally. In its passage it is related dorsally to the right lobe of the pancreas, ventrally to the jejunum and medially to the ascending colon and caecum.
**The descending duodenum passes out of the pylorus of the stomach (on the right side of the abdomen) and has a sigmoid flexure. It passes towards the right abdominal wall and rises dorsally. In its passage it is related dorsally to the right lobe of the pancreas, ventrally to the jejunum and medially to the ascending colon and caecum.
**The ascending duodenum is shorter and bends ventrally to enter the mesentery and becomes the jejunum.
**The ascending duodenum is shorter and bends ventrally to enter the mesentery and becomes the jejunum.
*Mesoduodenum attaches the duodenum to the dorsal abdominal wall.
*Mesoduodenum attaches the duodenum to the dorsal abdominal wall.
*The pancreatic and bile ducts open into the duodenum.
===Species Differences===
===Species Differences===