!Intestine – Duodenum Overview
!!Anatomy
The duodenum belongs to the ((Digestive - System Overview|digestive tract)). It is the first section of the ((Digestive - Small Intestine Overview|small intestine)), which follows the ((Digestive - Stomach - Mucosa (Lesser Curvature and Pylorus)|pylorus)) and precedes the ((Digestive - Small Intestine - Jejunum, Ileum|ileum and jejunum)). The name duodenum is from the Latin duodenum digitorum, or "twelve fingers' breadth".
The ((Digestive - Gallbladder and Bile Ducts|bile duct)) and the ((Digestive - Pancreas Ducts|pancreas duct)) empty into the duodenum. Here, most __chemical digestion__ takes place.

The beginning section of the duodenum is widened into an “onion shape” (((Digestive - Duodenum - Bulbus Mucosa |bulbus duodeni))) and is covered by ectodermal (Cerebral Cortex directed) squamous epithelium tissue. The remaining small intestine lining consists of ((Digestive - Duodenum Mucosa (Villi)|ciliated duodenum epithelium)) tissue and is of endodermal origin.

{img fileId="243" thumb="box"}graphic: wikipedia/Mariana Ruiz Villarreal

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{img fileId="204" thumb="box"}graphic source: wikipedia

!!Brain
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!!!Relay:
*__Cerebral Cortex__ (-/+) insular region medio-lateral right hemisphere "4 o'clock", for ((Digestive - Duodenum - Bulbus Mucosa |duodenum bulbus mucosa))
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*__Brain Stem__ (+/-) fronto-medial right, for ((Digestive - Duodenum Mucosa (Villi)|Villi)) and
*__Midbrain__ (+/-) fronto-medial right, for ((Digestive - Intestine Smooth Muscle|smooth muscle))
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*__Cerebral Medulla__ (-/+) "lumbar area" right hemisphere, for ((Organ Walls - Submucosa Layer|submucosa layer))
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