Editing Small intestine (section)

===Microanatomy===
{{Main|Gastrointestinal wall}}
[[File:Small intestine low mag.jpg|thumb|right|200px|[[Micrograph]] of the small intestine [[mucosa]] showing the [[intestinal villi]] and [[crypts of Lieberkühn]].]]
The three sections of the small intestine look similar to each other at a microscopic level, but there are some important differences. The parts of the intestine are as follows:
[[File:Cross Section of a Small Intestine.png|thumb|This cross section diagram shows the 4 layers of the small intestine wall.]]
{| class="wikitable"
! Layer || [[Duodenum]] || [[Jejunum]] || [[Ileum]]
|-
| [[Serosa]] || 1st part serosa, 2nd–4th adventitia || Normal || Normal
|-
| [[Muscularis externa]] || Longitudinal and circular layers, with [[Auerbach's plexus|Auerbach's (myenteric) plexus]] in between || Same as duodenum || Same as duodenum
|-
| [[Submucosa]] || [[Brunner's glands]] and [[Meissner's plexus|Meissner's (submucosal) plexus]] || No BG || No BG
|-
| [[Mucosa]]: [[muscularis mucosae]] || Normal || Normal  || Normal
|-
| Mucosa: [[lamina propria]] || No PP || No PP || [[Peyer's patches]]
|-
| Mucosa: [[intestinal epithelium]] || [[Simple columnar epithelium|Simple columnar]]. Contains [[goblet cells]], [[Paneth cell]]s || Similar to [[duodenum]], but the [[intestinal]] villus is long || Similar to [[duodenum]], but the [[intestinal villus]] is short
|}