Glandular epithelium can be classified in several ways: 1) By the presence or absence of duct systems into exocrine or endocrine glands. 2) Exocrine glands can be multicellular or unicellular based on cell number, and can secrete products through merocrine, holocrine, or apocrine secretion modes. 3) Exocrine glands can also be classified by the type of secretory product into serous, mucous, or mixed seromucous glands.

3. Glandular epithelium is classified according to the presence : or absence of duct system into

5. Exocrine glands might be classified into: 1- According the number of cells :

6. Multicellular gland Unicellular gland

7. 2. According to the mode of secretion: the secretory product is discharged with parts of apical cytoplasm . eg. Mammary an axillary sweat glands . C. Apocrine glands

9. 3.According to the type of secretory product:

10. serous gland & mucous gland seromucous (mixed ) gland

11. 4. According to the shape of the ducts which transport the secretion

12. Simple branched gland

13. 5. According to the shape of secretory portion which contains the cells responsible for secretion: