This MedLibrary.org supplementary page on Transverse muscular fibers is provided directly from the open source Wikipedia as a service to our readers. Please see the note below on authorship of this content, as well as the Wikipedia usage guidelines. To search for other content from our encyclopedia supplement, please use the form below:
Related Sponsors
| Muscularis externa | |
|---|---|
 |
|
| LAYERS: serosa longitudinal muscle myenteric plexus circular muscle submucosal plexus submucosal mucosal |
|
 |
|
| Transverse section of ureter. | |
| Latin | tunica muscularis |
The muscular coat (muscular layer, muscular fibers, muscularis propria, muscularis externa) is a region of muscle in many organs in the vertebrate body, adjacent to the mucous membrane. It is responsible for gut movement such as peristalsis.
It usually has two distinct layers of smooth muscle:
- inner and "circular"
- outer and "longitudinal"
However, there are some exceptions to this pattern.
- In the stomach, there are three layers to the muscularis externa.
- In the upper esophagus, part of the externa is skeletal muscle, rather than smooth muscle.
The inner layer of the muscularis externa forms a sphincter at two locations of the alimentary canal:
- in the pyloric stomach, it forms the pyloric sphincter
- in the anal canal, it forms the anal sphincter
Additional images
 Wall of the ureter. |
 Layers of stomach wall. |
 Section of the human esophagus. Moderately magnified. |
 Section of duodenum of cat. X 60. |
 Vertical section of bladder wall. |
External links
- muscular+layer at eMedicine Dictionary
- Histology at nhmccd.edu
- Bioweb at UWLAX Muscularis externa of the colon
- Bioweb at UWLAX Smooth muscle layers of the gut
- Histology at OU 52_05 - "Duodenum"
- Organology at UC Davis Digestive/mammal/system1/system7 - "Mammal, whole system (LM, Low)"
- UIUC Histology Subject 23
- Histology at BU 11601ooa - "Muscle Tissue: smooth muscle, muscularis externa"
- Histology at BU 10802loa - "Digestive System: Alimentary Canal - esophagus "
|
|||||
This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.
 |
This anatomy article is a stub. You can help Wikipedia by expanding it. |
Wikipedia content modification information:
- This page was last modified on 21 June 2008, at 13:55.
Wikipedia Authorship and Review
Wikipedia content provided here is not reviewed directly by MedLibrary.org. Wikipedia content is authored by an open community of volunteers and is not produced by or in any way affiliated with MedLibrary.org.
Wikipedia Usage Guidelines
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article on "Transverse muscular fibers".
The URL for this specific entry is:
All Wikipedia text is available under the terms of the GNU Free Documentation License. (See Copyrights for details). Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc.