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Salivary gland histology
- 1. Salivary Glands Dr PrennieVidiera Father Muller Homoeopathic Medical College & Hospital
- 2. • Parotid glands •Submandibular glands • Sublingual glands
- 3. • Numerous smallglands situated in the mucous membrane – Lips : labial glands – Cheeks: buccal glands – Tongue: lingual glands – Palate: palatine glands
- 4. • Secretions, – Keepmouth moist – Protection – Lubrication – Enzymes (amylase & lysozymes) – Immunoglobulin A
- 5. • Salivary glandsare compound tubulo-alveolar glands (racemose) • Secretory elements (end pieces/portio terminalis) may be rounded (acini) pear shaped (alveoli) tubular mixture (tubulo-acinar or tubulo-alveolar)
- 6. secretory element lead into Seriesof ducts through Secretions are poured into the oral cavity
- 8. • On section, largenumber of closely packed acini/alveoli Ducts scattered between them • Supported by connective tissue
- 10. Connective tissue, • divides glands intolobules • forms capsules Blood vessels, lymphatics and nerves run in the connective tissue
- 11. Alveoli • Cell liningare serous / mucous
- 12. Serous Stain darkly (zymogen granules) Rounded nuclei Towardsthe base Mucous Stains lightly Appears empty Cells filled with mucoid materials Flattened Nuclei towards basements
- 15. Alveolus • Made upof serous or mucous cells • Some cases, mucous alveoli are covered by groups of serous cells arranged in the form of Crescents or demilunes
- 17. Alveolus in, parotid gland– entirely serous occ, mucous submandibular gland – mixed Sublingual gland – mucous
- 18. • Secretory unit/gland, with only one type of cell – homocrine more than one variety – heterocrine All the 3 major salivary glands are heterocrine
- 19. Secretions produced inalveoli pass along A system of ducts (different parts of these have differing structure) smallest ducts Intercalated ducts lined by Cuboidal / flattened cells open into Straited ducts Lined by
- 20. Columnar cells Open into Excretoryducts Lined by Simple columnar epithelium
- 24. Myoepithelial cells • Presentin relation to alveoli & intercalated ducts of salivary glands. • On alveoli, these are branched. • On ducts, these are fusiform & run longitudinally • Cilia are present on some
- 25. • These arecontractile • Contractions help to squeeze out secretion from alveoli