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The lamina muscularis mucosae (or muscularis mucosae) is a thin layer (lamina) of muscle of the gastrointestinal tract, located outside the lamina propria and separating it from the submucosa. It is present in a continuous fashion from the esophagus to the upper rectum (the exact nomenclature of the rectum’s muscle layers is still being debated). A discontinuous muscularis mucosae–like muscle layer is present in the urinary tract, from the renal pelvis to the bladder; as it is discontinuous, it should not be regarded as a true muscularis mucosae.

Muscularis mucosae
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Section of duodenum of cat. X 60. (Muscularis mucosae labeled at right, third from the top.)
Details
Identifiers
Latin Lamina muscularis mucosae
TA A05.4.01.016
FMA 63050
Anatomical terminology

In the gastrointestinal tract, the term mucosa or mucous membrane refers to the combination of epithelium, lamina propria, and (where it occurs) muscularis mucosae.[1] The etymology suggests this, since the Latin names translate to "the mucosa's own special layer" (lamina propria mucosae) and "muscular layer of the mucosa" (lamina muscularis mucosae).

The muscularis mucosae is composed of several thin layers of smooth muscle fibers oriented in different ways which keep the mucosal surface and underlying glands in a constant state of gentle agitation to expel contents of glandular crypts and enhance contact between epithelium and the contents of the lumen.

Additional imagesEdit

ReferencesEdit

  1. ^ H.G. Burkitt et al., Wheater's Functional Histology, 3rd ed.

Stacey E. Mills — Histology for Pathologists: 3rd (third) Edition, page 670. ISBN 9780781762410

External linksEdit