1. Part 1 - Epithelial Tissues
Lab Exercise #6a
Part 1 - Epithelial Tissues

2. Let’s review….

3. Simple cuboidal epithelium
lining a tubule (longitudinal cut). Some of the cell boundaries between "blocks" or "cubes" here are quite distinct.

4. Simple Cuboidal
Covers surface of ovary, lines kidney tubules and small ducts of glands (thyroid and pancreas)

5. Tubule - cross section simple cuboidal

6. Another example - kidney

7. Type?

8. Simple squamous epithelium
High power view of endothelial cells lining a small blood vessel cut in cross-section. (You see just the nuclei - the cytoplasm between them is extremely flat.) Endothelium = the simple squamous epithelium lining blood vessels.

9. Simple squamous epithelium

10. Kidney

11. Superficial view (squamous)

12. Type?

13. Simple columnar
Another example – intestine, with goblet

14. Intestinal lining

15. Yet another

16. Type?

17. Pseudostratified ciliated columnar epithelium
Trachea. Nuclei are at different levels. All cells touch the basement membrane, but only the taller cells reach the lumen. The cilia are longer and less regular than the microvilli of a striated border.

18. Pseudostratified Columnar Epithelium
Look like multiple layers
Trachea
Figure 4–5b

19. Another example

20. Cilia – surface view

21. Type?

22. Bladder Low power

23. Transitional Epithelium
Tolerates stretching
Appearance changes (stratified to simple)
Urinary bladder
Figure 4–4c

24. Type?

25. Stratified Squamous Epithelium
Figure 4–3b

26. Example

27. Example

28. Type?

29. Type?

30. Stratified Cuboidal Epithelium
Sweat gland ducts
Figure 4–4b

31. Type?

32. Stratified Columnar Epithelium
Rare
Salivary gland duct
Figure 4–5c

33. Note
It is the shape of the most superficial layer that determines what type of stratified epithelium it is.

34. Today’s procedure Set up microscope Get a slide (or up to 3 or 4)
Follow instructions in Lab Manual
Hints
Start on low power and locate epithelium (this is the bulk of the work)
Go to 10x, then 40x
Draw tissue
Return slide to box you got it from.

35. Today’s lab
Examine and draw at least one of each type of epithelial tissue
Activity 1:
Simple squamous
Simple cuboidal
Simple columnar
Psuedostratified ciliated columnar
Transitional
Stratified squamous
Stratified columnar
Stratified cuboidal (?)

36. To turn in:
8 drawings on page I provide
Review sheet