*1.3.4 Mucous glands*

Mucous glands secrete carbohydrate properties. Since these granules are lost when preparing hematoxylin–eosin stained sections, these parts of the cells are often seen as empty. Therefore, these glands secrete in dense consistency and are lightly colored, and the discharge ducts are wider than the serous glands (**Figure 11d**) [4–9].

The epithelial cells of the gland are divided into three types according to the type of secretion:

