Histology of salivary glands

1. Salivary Glands

2. Salivary Glands
Major Salivary Glands
• Parotid
• Submandibular
• Sublingual
Minor Salivary Glands
• Labial
• Buccal
• Palatine
• Lingual Compound Tubuloacinar

3. Gland
1
2
3 4
Epithelial specialization for secretion

4. Classification of Glands
Arrangement of Cell
Unicellular : Goblet cells
Multi cellular
Pouring of secretion
Endocrine (ductless)
Exocrine (with ducts)
According to shape
Tubular
Acinar
Alveolar

5. Classification of Glands
According to Structure
Simple
Compound

6. Mode of secretion
Merocrine (Eccrine)
Apocrine
Holocrine
Type of secretion
Serous
Mucous
Mixed
Classification of Glands

7. Salivary Glands
Parotid-Purely Serous
Submandibular-Mixed
Sublingual –Mostly mucous, some demilunes
Structure: Covered by capsule
CT septa & trabecule, Lobular structure
BVs , nerves, lymphatics & ducts run in septa
Acini make up the parenchyma

8. Serous & Mucous Acinus
Serous acinus Mucous acinus
Size & Staining
Lumen & nucleus
Cytoplasm Zymogen granules Mucous granules
Myoepithelial cells Present Present

9. Ducts of Salivary Glands
Intralobular Ducts
Intercalated Duct: Squamous or low
cuboidal epithelium
Striated Duct: Simple Columnar epithelium
Basal striations due to in folding of BM

10. Ducts of Salivary Glands
Interlobular ducts
Located in CT Septa
Pseudostratified Columnar
Becomes Stratified Columnar then
Stratified squamous non keratinized as the duct
enters the oral cavity

11. Parotid Gland

12. Submandibular Gland

13. Sublingual Gland