|Section of duodenum of cat. X 60. (Muscularis mucosae labeled at right, third from the top.)|
|Gray's||subject #245 1144|
The lamina muscularis mucosae (or "muscularis mucosa") is the thin layer of smooth muscle found in most parts of the gastrointestinal tract, located outside the lamina propria mucosae and separating it from the submucosa.
In the gastrointestinal tract, the term mucosa or "mucous membrane" refers to the combination of epithelium, lamina propria, and (where it occurs) muscularis mucosa. 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 mucosa is composed of several thin layers of smooth muscle fibers oriented in different ways which keeps 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.
- H.G. Burkitt et al., Wheater's Functional Histology, 3rd ed.
Section of the human esophagus. Moderately magnified.
- Bioweb at UWLAX aplab
- Muscularis+mucosae at eMedicine Dictionary
- Histology at OU 14_08 - "Lung"
- Essentials of Human Physiology by Thomas M. Nosek. Section 6/6ch1/s6ch1_11.
- Organology at UC Davis digestive/mammal/system1/system4 - "Mammal, whole system (LM, Low)"
- UIUC Histology Subject 830