Histological structure of stomach

 T. S. of Stomach of Mammal

The stomach is bag-like structure.

1.   Histologically the stomach shows the following parts

2.  Serosa

3.  muscularis externa

4.  Sub-mucosa

5.  Muscularis mucosa

6.  Mucosa

a.  Outermost layer of the stomach is called serosa is made up of squamous epithelium.

b.  Muscularis externa consists of outer longitudinal and inner circular muscle layer.

c.    Below the muscularis there is a submucosa made up of connective tissue containing blood vessels, nerves, and lymph vessels.

d.   Below the submucosa there is muscular mucosae consists of two layers of muscle. according to their plan, they are called  longitudinal muscle layer  and circular muscle layer

e.   The muscularis mucosae is followed by the thickest layer called mucosa consists of simple columnar epithelium and gastric glands.

f.    The gastric glands are long and arranged parallel to each other. These are simple or simple tubular glands.

g.  The gastric glands consist of two types of cells namely oxyntic and peptic cells.

h.  The peptic cells secrete digestive enzymes and oxyntic cells secrete HCl.

Function of stomach:

1.  Digestion of food.

2.  Secretion of gastric juice.

3.  Gastric juice contains HCl and Pepsin.