Muscularis mucosae

The lamina muscularis mucosae (or muscularis mucosae) is the thin layer of smooth muscle found in stomach, located outside the lamina propria mucosae and separating it from the submucosa.

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.