Glandular Epithelium

• What are the 2 types of Glandular epithelium based on their CONNECTIONS WITH THE SURFACE EPITHELIUM?

  Endocrine and Exocrine
• EXOCRINE GLANDS: REMAIN CONNECTED with the surface epithelium via the TUBULAR DUCTS which delivers their secretions.
• ENDOCRINE GLANDS: LOOSE connections to their epithelium, instead, their secretions are poured DIRECTLY into the specialized capillaries
• Secretory units of both exocrine and endocrine glands are supported by WHAT?

  Stroma of Connective Tissues
• What separates the GLAND into LOBULES?

  Septa
• What encloses the entire exocrine gland?

  Capsule
• SIMPLE: ducts not branched
• COMPOUND: ducts with 2 or more branches
• TUBULAR: either short or long and coiled
• ACINAR: rounded and saclike
• What are the 3 basic mechanisms for secretion?

  Merocrine, Holocrine, and Apocrine
• Merocrine secretion: MOST COMMON method of protein or glycoprotein secretion. Involves EXOCYTOSIS.
• Holocrine secretion: secretory cells accumulate product and DISINTEGRATE, releasing their contents.
• Apocrine secretion: secretory cell’s product accumulate at the cell’s apical end which is then PINCHED off, releasing its contents
• What are the 2 types according to the nature of their secretory products?

  Serous cells and mucous cells
• Serous cells: secrete proteins that are NOT HEAVILY GLYCOSYLATED, such as digestive enzymes. Stain intensely with basophilic or acidophilic stains.
• Mucous cells: contain HEAVILY glycosylated proteins called mucins.
• Mucins: heavily glycosylated proteins
• Mucous cells stain poorly with what?

  Eosin
• Serous cells stain intensely with what?

  Acidophilic and basophilic stains
• Myoepithelial cells: contractile cells found in many exocrine glands