Muscularis externa

Muscularis externa

Infobox Anatomy
Name = PAGENAME
Latin = tunica muscularis
GraySubject =
GrayPage =


Caption = LAYERS:
serosa
longitudinal muscle
myenteric plexus
circular muscle
submucosal plexus
submucosal
mucosal


Caption2 = Transverse section of ureter.
System =
MeshName =
MeshNumber =
DorlandsPre = t_22
DorlandsSuf = 12832129

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

External links

*
* [http://science.nhmccd.edu/BioL/urinary/bladder2.htm Histology at nhmccd.edu]
*
*
* - "Duodenum"
* - "Mammal, whole system (LM, Low)"
*
* - "Muscle Tissue: smooth muscle, muscularis externa"
* - "Digestive System: Alimentary Canal - esophagus "


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Look at other dictionaries:

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  • Muscularis propria — The Muscularis Propria or Muscular coat is the muscular layer in the walls of the digestive and urogenital systems [http://training.seer.cancer.gov/ss module05 bladder/unit02 sec02 anatomy.html ] . It is made of three individual muscle layers:… …   Wikipedia

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  • Tracto gastrointestinal — El tracto gastrointestinal, también llamado tracto digestivo, o canal alimentario, es el sistema de órganos en los animales multicelulares que consumen alimentos, los digieren para extraer energía y nutrientes y expulsar los residuos que quedan.… …   Wikipedia Español

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