Muscularis externa Totally Explained

Everything about Muscularis Externa totally explained

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

Image:Illu ureters wall.jpg|Wall of the ureter. Image:Illu stomach layers.jpg|Layers of stomach wall. Image:Gray1033.png|Section of the human esophagus. Moderately magnified. Image:Gray1058.png|Section of duodenum of cat. X 60. Image:Gray1141.png|Vertical section of bladder wall. Further Information

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