1. HISTOLOGY
The study of tissues…

2. Characteristics of Epithelial Tissue
Covers body surfaces
Lines hollow organs, body cavities, ducts, glands
Features closely packed cells
Has a surface exposed to the lumen (Apical surface)
Has a surface attached to other tissue (Basement layer)

3. Characteristics of Epithelial Tissue
Is avascular
Obtains nutrients via diffusion
Has a nerve supply
Has a high mitotic rate
Diverse in structure and function
Overall main f(x) = protection & filtration
Cells exist in continuous sheets
-Simple = Single layer of cells
-Stratified = Multiple layer of cells

4. Types of Epithelial Tissues
Simple Cuboidal
Simple Columnar
Simple Squamous
Stratified Squamous
Stratified Cuboidal
Pseudostratified E.T.

5. Simple Cuboidal E.T.

6. Simple Cuboidal E.T. “Cubed” Shape
Nuclei are round and near the center
F(x) = secretion
Loc. = Kidneys

7. Simple Columnar E.T.

8. Simple Columnar E.T. Cells are longer than they are wide
“Column” or rectangular appearance
Nuclei are oval shaped
F(x) = Absorption due to large surface area
Loc. = Stomach, Intestines

9. Simple Squamous E.T.

10. Simple Squamous E.T. “Squashed” Appearance Flat & Thin
F(x) = Diffusion of gases
Loc: = Lungs, Kidneys

11. Stratified Squamous E.T.

12. Stratified Squamous E.T.
Stratified = multiple layers
Top layer is flat!!
F(x) = Protection
Loc. = Inside of mouth, Epidermis, Vagina

13. Pseudostratified E.T.

14. Pseudostratified E.T. Cells have columnar appearance
Look as though there is more than one layer
Goblet cells embedded within
Apical surface lined with cilia

15. Pseudostratified E.T. (cont’d)
F(x) = trap foreign materials
F(x) = move sex cells (sperm & egg)
Loc. = Upper respiratory tract and Uterus

16. Transitional E.T.

17. Transitional E.T. No discernible shape when muscle is contracted
Some cells are multinucleate
Apical surface may be dome shaped
F(x) = Provides elasticity
Location = Uterus, Bladder

18. Connective Tissue Proper (C.T.P.)
Most abundant tissue type
All connective tissue contains matrix
C.T.P. is vascular w/few exceptions
Tendons & Ligaments are avascular

19. Hyaline Cartilage Most common type of cartilage Contains chondrocytes
Loc: Ends of bones, Nose, Trachea