Muscularis mucosae

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Muscularis mucosae

The lamina muscularis mucosae (or muscularis mucosa) is the thin layer of smooth muscle

Smooth muscle

Smooth muscle is a type of non-striated muscle, found within the tunica media layer of large and small arteries and veins, the urinary bladder, uterus, male and female reproductive tracts, gastrointestinal tract, respiratory tract, the ciliary muscle, and iris of the eye....
found in most parts of the gastrointestinal tract

Gastrointestinal tract

The digestive tract is the system of Organ s within multicellular animals that takes in food, digestion it to extract energy and nutrients, and expels the remaining waste....
, located outside the lamina propria mucosae

Lamina propria

The lamina propria is a constituent of the moist linings known as mucous membranes or mucosa, which line various tubes in the body .The lamina propria is a thin layer of areolar connective tissue which lies beneath the epithelium and together with the epithelium constitutes the mucosa....
and separating it from the submucosa

Submucosa

In the gastrointestinal tract, the submucosa is the layer of dense irregular connective tissue that supports the mucosa, as well as joins the mucosa to the bulk of underlying smooth muscle ....
.

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

Crypt (anatomy)

Crypts are anatomical structures that are narrow but deep invagination into a larger structure.One common type of anatomical crypt is the Crypts of Lieberk?hn....
and enhance contact between epithelium and the contents of the lumen

Lumen (anatomy)

A lumen in biology is the inside space of a tubular structure, such as an artery or intestine. By extension, a lumen can also be the inside space of a cellular component or structure, such as the endoplasmic reticulum....
.