1. Basic tissues Simple epithelia
Dr. Károly Altdorfer

8. Basic tissues Simple epithelia
Dr. Károly Altdorfer

10. Organs (stomach, eyeball)  Tissues (epithelia, …)  Cells

11. Red (acidophil, eosinophil)
Stainings:
Most common:
Hematoxylin-eosin (H-E)
Blue (basophil)
Red (acidophil, eosinophil)

12. Basic tissues

13. Epithelial tissue is composed of tightly packed cells.
Types of epithelia
Covering epithelia
Glandular epithelia
Pigment epithelia
Sensory epithelia
(Myoepithelium)

14. Epithelial tissue
Functions of epithelial cells:
-protection of the internal environment (mechanical+biological)
-resorption, excretion of materials
-secretion

15. Simple epithelia

16. Simple squamous epithelium (endothelium, mesothelium, epithelium)

17. Simple squamous epithelium (mesothelium, AgNO3 impr.)

18. Simple cuboidal epithelium

19. Simple columnar epithelium

20. Pseudostratified columnar epithelium (epididymis)

22. Apical
Lateral
Basal
cell surfaces

23. Apical
Lateral
Basal
cell surfaces

24. Apical surface: microvilli (cuticle – brush border - stereocilia)

27. Apical
Lateral
Basal
cell surfaces

28. Apical surface: microvilli, cilia
Lateral surface:
- Tight junctions (diffusion barrier)
- (mechanical barrier)
or Macula adherens (strong cell junction)
(cell connections: transport)

29. Apical surface
Lateral surface:

31. Zonula occludens (tight junction)

32. Desmosome or Macula adherens

34. Apical
Lateral
Basal
cell surfaces

35. Basal striation

36. Basal membrane = basal lamina + fibroreticular lamina
(Light microscope electrone microscope)