1. Types of Acini in Salivary Glands 1) Serous 2) Mucous 3) Mucoserous Serous demilune Crescent of Gianuzzi

2. Myoepithelial Cells (Basket Cells) Stellate-shaped cells which embrace acini & ducts as an octopus. Function ???

3. Duct System 1) Intercalated ducts: Simple cubical epithelium . 2) Striated (Intralobular) ducts: Cuboidal or low columnar cells with rounded nuclei. 3) Interlobular (Excretory) ducts: Columnar cells. 4) Interlobar ducts: Pseudostratified columnar. 5) Main Duct: Stratified Columnar then strtified squamous at its end.

5. Parotid Stroma is well developed Trabeculae (Septa) are thick & rich in adipocytes (A). Parenchyma: Mostly serous acini (S). S A

7. Intercalated Duct (arrow) It extends from a secretory acinus (S) Acini empty their secretions into these ducts, Lined with Simple cubical epithelium . Have acidophilic cytoplasm . S

8. S S S: Serous Acini A: Intercalated Duct: Simple Cubical B: Intralobular (Striated) Duct: Low columnar cells.

9. Intralobular (Striated) Duct: Arrow Low Columnar cells with rounded nuclei Cytopalsm is acidophilic with basal acidophilic striations .

10. Interlobar (Excretory) Ducts Pseudostratified Columnar Epithelium 2: C.T. Septa

11. Submandibular Gland: “ Human ” Seromucous Gland: In humans, 90% of its acini are serous & 10% are mucous and mucoserous. Main Duct: Wharton´s Duct . Opens on the sublingual papilla at the side of the tongue on the floor of the mouth cavity.

12. Seromucous Gland

13. Submandibular Gland “Dog” 1- Serous Secretory Unit 2- Mixed ,,,, ,,,,, 3- Intercalated Excretory Duct 4- Striated ,,,,, ,,,,, Mainly Mucous

14. Serous Demilunes from Submandibular Gland

17. Sublingual Salivary Gland Mucoserous gland Mucous acini predominate. Some mucoserous acini. NO pure serous acini.

18. SD: Serous demilune N: Nuclei of myoepithelial cells CT: Connective tissue MA: Mucous acini L: Lumen Ns: Nuclei of serous cells

19. Datashow Exam

20. Identify the type of acini. Mention their histological characteristics. (1)

21. (2)

22. (3)

26. a) Identify the type of acini present in the field. b) What does the arrow point to? c) This gland is most probably ------------------------- (7)

28. Stroma of Pancreas Trabeculae: Thin, delicate, divide the gland into ill-distinct lobes and lobules.

29. Parenchyma: (I) Exocrine Portion: Acini & Ducts.

30. Pancreas – Secretory acini w/ zymogen granules

31. Centroacinose Cells

32. (II) Endocrine Portion: Islets of Langerhans

33. Pancreas – Secretory acini & Islet of Langerhans Lobule

34. DataShow Exam

35. a) What does the arrow & arrowhead point to? b) Identify the organ. (2)

36. a ) This is a mixed gland. Identify the exocrine & endocrine Components. Mention the function of each. b) This gland is ------------------------------ (3)

37. (3)