The inner mucous layer present in the lining of the stomach is known as Gastric Mucosa. This term mucosa is used to reflect the presence of mucus in this area which comes from the secretion of epithelial cells. The role of the Gastric Mucosa is not only restricted to lubricating the particles of food but also to soothe and ease the movement inside the stomach. It also acts as a layer of protection to prevent the stomach from getting digested by the enzymes present within the stomach.
The membrane is velvety to touch and has a smooth surface. It is 1mm thick and carries different glands and the gastric pits known as foveolaegastricae. Almost 100 such pits are found every square millimeter of the surface. Under the membrane is muscularismucosae which are layers of a velvety muscle that hides beneath it a connective tissue known as the submucosa. It is this connective tissue that forms a connection between the gastric mucosa and the stomach wall’s muscles.
Gastric Mucosa carries different types of cells including:
- Tall Columnar Surface Epithelial Cells
- Mucoid Cells
- Zymogenic Cells (Chief Cells)
- Gastrin Cells
- Oxyntic or Parietal Cells
- Endocrine Cells