Submucosa

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]


Overview

Submucosa
Ens.png
LAYERS:
serosa
longitudinal muscle
myenteric plexus
circular muscle
submucosal plexus
submucosal
mucosal
Mid esophageal mass.jpg
Endoscopy and radial endoscopic ultrasound images of submucosal tumour in mid-esophagus. The submucosa is seen as a dark ring on the ultrasound image.
Dorlands/Elsevier s_27/12765896

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List of terms related to Submucosa

In the gastrointestinal tract, the submucosa is the layer of loose connective tissue that supports the mucosa, as well as joins the mucosa to the bulk of underlying smooth muscle (fibers running circularly within layer of longitudinal muscle).

Contents

Blood vessels, lymphatic vessels, and nerves (all supplying the mucosa) will run through here.

Tiny parasympathetic ganglia are scattered around forming the submucosal plexus (or "Meissner's plexus") where preganglionic parasympathetic neurons synapse with postganglionic nerve fibers that supply the muscularis mucosae.

The submucosa in endoscopy

Identification of the submucosa plays an important role in diagnostic and therapeutic endoscopy, where special fibre-optic cameras are used to perform procedures on the gastrointestinal tract. Abnormalities of the submucosa, such as gastrointestinal stromal tumors, usually show integrity of the mucosal surface.

The submucosa is also identified in endoscopic ultrasound to identify the depth of tumours and to identify other abnormalities. An injection of dye, saline, or epinephrine into the submucosa is imperative in the safe removal of certain polyps.

Endoscopic mucosal resection involves removal of the mucosal layer, and in order to be done safely, a submucosal injection of dye is performed to ensure integrity at the beginning of the procedure.

See also

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