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why mucus is seen in stomach also
The surface of the stomach is lined by a simple columnar epithelium whose cells are called surface mucous cells.  There are numerous invaginations of the surface epithelium into the lamina propria.  These invaginations are called gastric pits or foveolae, and are also lined by surface mucous cells.

The surface mucous cells produce a cloudy, viscous and alkaline mucous that forms a thick gel-like coat that adheres to the surface epithelium and protects it from abrasion and the acid content of the stomach.
In the case of the stomach, the muscularis mixes the chyme and expels it into the small intestine.

 The most abundant epithelial cells are mucous cells, which cover the entire lumenal surface and extend down into the glands as "mucous neck cells".

These cells secrete a bicarbonate-rich mucus that coats and lubricates the gastric surface, and serves an important role, in protecting the epithelium from acid and other chemical  reactions.


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