Muscular layer

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Muscular layer
Gray1134.png
Histological section of the ureter, showing the thick muscular layers surrounding the lumen.
Details
Latin tunica muscularis
Dorlands
/Elsevier
t_22/12832129
Anatomical terminology

The muscular layer (muscular coat, muscular fibers, muscularis propria, muscularis externa) is a region of muscle in many organs in the vertebrate body, adjacent to the submucosa. It is responsible for gut movement such as peristalsis.

Structure[edit]

It usually has two distinct layers of smooth muscle:

  • inner and "circular"
  • outer and "longitudinal"

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:

References[edit]

This article incorporates text from a public domain edition of Gray's Anatomy.

External links[edit]