1. BODY TISSUES HISTOLOGY!
NOTES in your notebook time!
Yea!! I LOVE
this stuff  

2. We’re MOVING ON! TISSUES: groups of cells that are similar in
structure & function
HISTOLOGY: branch of anatomy dealing with the microscopic structures of tissues

3. 4 main types of tissue: 1) Epithelial 2) Connective 3) Muscle
4) Nervous

4. EPITHELIAL TISSUE Also known as EPITHELIUM
Location: Is the lining, covering, and glandular tissue of the body!

5. FUNCTIONS OF EPITHELIUM
Protection
Absorption
Filtration
Secretion

6. Each Epithelium has 2 names:
First part of name = # of CELL LAYERS
Second part of name = SHAPE

7. CLASSIFICATION OF EPITHELIUM FIRST NAME
SIMPLE  very thin – one layer of cells
Functions: absorption, secretion, filtration

8. STRATIFIED Stratified  two or more layers of cells * more durable
Functions: protection

9. PSEUDOSTRATIFIED
Pseudostratified  false stratified; gives the impression that it is stratified but it is not
Some cells are shorter than others so the nuclei do not all line up
Really just one layer!

10. SECOND NAME SQUAMOUS
Squamous  flattened like fish scales
Draw:

11. CUBOIDAL
Cuboidal  cube-shaped like dice
Draw:

12. COLUMNAR
Columnar  shaped like columns
Draw:

13. 2 PART NAMES:
STRATIFIED epithelia are named for the cells at the FREE SURFACE of the epithelial membrane!

14. CHARACTERISTICS of Epithelium
These cells form continuous sheets because they fit closely together (abut each other)
2) There is always one unattached surface (free surface) or edge.
* called the APICAL SURFACE

15. Cont. Lower surface of epithelial tissue rests on a basement membrane
*Basement membrane  thin layer of extracellular material to which epithelial cells are attached

16. Cont. Epithelium is AVASCULAR – no blood supply of own
blood gets to these
cells by diffusion from capillaries
5) Epithelial cells regenerate themselves easily if well nourished (near blood)

17. Epithelial Tissue
LOCATIONS

18. Simple Squamous Epithelium
Location
Walls of blood vessels, air sacs in lungs
Lines ventral body cavity

19. Simple Cuboidal Epithelium
Location
Glands, kidney tubules, covers ovaries

20. Simple Columnar Epithelium
Location
Lines digestive tract
Ciliated variety in respiratory tract

21. Pseudostratified Columnar Epithelium
Location
Respiratory tract including trachea

22. Stratified Squamous Epithelium
Location
Skin (has keratin), mouth & throat

23. Transitional Epithelium
Location
Urinary bladder, ureters & urethra