1. Classification of Tissues: Epithelial Tissue
Tissue: a collection of similar cells working together
Epithelial Tissue: cells that cover the surfaces of organs or form a lining within a cavity
Turn to: page 56 of the lab book and page of the lab packet

2. Apical surface: the very top surface of epithelial tissue Basement membrane (basal surface): the very bottom surface of epithelial tissue Lumen: The open space above the apical surface of a structure
Apical Surface
LUMEN
Epithelial Tissue
Connective Tissue
(another type of tissue;
Always found supporting the basement membrane)
Basement Membrane

3. Lumen: The inner open space or cavity of a tubular organ, as of a blood vessel or an intestine.
Apical Surface
Connective
Tissue
LUMEN
Epithelial
Tissue
Basement Membrane

4. Classification of Epithelia
1. Number of cell layers

5. 2. Shape of the cells

6. I will use BOTH microscopes AND histograms to test you on epithelial tissues. Make sure you look at the microscopes in lab and the histograms in this presentation.

7. Simple Squamous Epithelia Alveoli (air sacs) of Lungs

8. Page 56

9. Simple Squamous Epithelium

10. Simple Squamous Epithelia

11. Simple Squamous Epithelium

12. Simple Cuboidal Epithelia Kidney Tubules

13. Page 56
Apical
surface

14. Simple Cuboidal Epithelium
Connective
Tissue
Apical Surface L L L L L L L
Basement Membrane

15. Simple Cuboidal Epithelium

16. Simple Cuboidal Epithelium

17. Simple Columnar Epithelium
Small Intestine
Small Intestine
Cross Section

18. Simple Columnar Epithelium
Lumen L

19. Simple Columnar Epithelium
Apical
surface
Basement
membrane
Connective
Tissue

20. Goblet Cells (mucus producing cell)
Magnified!!!
Goblet Cells

21. Simple Columnar Epithelia: pointer is on the basement membrane

22. Simple Columnar Epithelia: pointer is on a goblet cell

23. Stratified Squamous Epithelia
Skin
Mouth & Esophagus

24. Page 58
Apical
surface
Lumen

25. Stratified Squamous Epithelium
LUMEN

26. Stratified Squamous Epithelium
LUMEN

27. Stratified Squamous Epithelium

28. Transitional Epithelia Urinary Bladder
Lumen
Lumen

29. Page 59

30. Transitional Epithelium
LUMEN

31. Transitional Epithelia

32. Transitional Epithelia: pointer is on the basement membrane

33. Pseudostratified Ciliated Columnar Epithelia
Lumen
Trachea

34. Page 57

35. Pseudostratified Ciliated Columnar Epithelium
LUMEN
Cilia

36. Pseudostratified Ciliated Columnar Epithelia

37. Pseudostratified Ciliated Columnar Epithelia