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 submucosa membrane. It is responsible for gut movement such as peristalsis.
It usually has two distinct layers of smooth muscle:
However, there are some exceptions to this pattern.
The inner layer of the muscularis externa forms a sphincter at two locations of the alimentary canal:
This article incorporates text from a public domain edition of Gray's Anatomy.
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