EPITHELIAL TISSUES

1. EPITHELIAL
TISSUES
BY- NIKHIL MAHESHWARI

2. GROUP OF CELLS WHICH PERFORM A COMMON FUNCTION
ARE CALLED TISSUES
.

3. BASIC TISSUES
 HUMAN BODY IS MADE UP OF 4 BASIC
TISSUES:
1) EPITHELIAL TISSUE
2) CONNECTIVE TISSUE
3) MUSCULAR TISSUE
4) NERVOUS TISSUE

4. EPITHELIAL
TISSUE
 LINES EXTERNAL AND INTERNAL SURFACE
OF OUR BODY.
 IT CAN BE ECTODERMAL, MESODERMAL
AND ENDODERMAL IN ORIGIN.

5. FUNCTION OF
EPITHELIAL
TISSUE
 PROTECTION
 SECRETION
 ABSORPTION
 FORMATION OF GLANDS AND DUCTS

6. CLASSIFICATION
 EPITHELIUM CAN BE SIMPLE OR
STRATIFIED.

7. SIMPLE EPITHELIUM
ALL CELLS REST ON BASEMENT MEMBRANE.

8. SQUAMOUS
EPITHELIUM

9.  CELLS ARE FLATTENED WITH NUCLEI RAISING A BULDGE IN CELL.
 ALLOWS RAPID EXCHANGE OF SUBSTANCES THROUGH ITSELF.
 EXAMPLE: EPITHELIAL LINING OF ALVEOLI

10. SIMPLE SQUAMOUS EPITHELIUM

11. CUBOIDAL
EPITHELIUM

12.  CELLS ARE LIKE SQUARE .
 HEIGHT OF CELL = WIDTH OF CELL
 NUCLEUS IS CENTRAL AND ROUND
 FUNCTION : ABSORPTION AND SECRETION
 EXAMPLE: EPITHELIAL LINING OF FOLLICLES OF THYROID GLAND

13. CUBOIDAL EPITHELIUM

14. COLUMNAR
EPITHELIUM

15.  HEIGHT OF CELLS > WIDTH OF CELLS.
 NUCLEI IS BASAL AND VERTICALLY ELONGATED
 FUNCTIONS : PROTECTION , SECRETION AND ABSORPTION.
 EXAMPLE: EPITHELIAL LINING OF FALLOPIAN TUBE.

16. SIMPLE COLUMNAR EPITHELIUM

17. PSEUDOSTRATIFIED
EPITHELIUM

18.  PSEUDO: FALSE
STRATIFIED: MULTI LAYERED
 FALSE APPEARANCE OF MULTILAYERED EPITHELIUM.
 SOME CELLS: SHORT , SOME ARE : TALL
 ALL CELLS REST ON BASEMENT MEMBRANE
 EXAMPLE : EPITHELIAL LINING OF TRACHEA

19. Pseudo stratified epithelium

20. STRATIFIED EPITHELIUM
MULYILAYERED EPITHELIUM IS KNOWN AS STRATIFIED EPITHELIUM

21. TRANSITIONAL
EPITHELIUM
 EPITHELIUM WHICH LINES AN ORGAN
AND IS DISTENSIBLE
 EXAMPLE : URINARY BLADDER

22. TRANSITIONAL
EPITHELIUM

23. STRATIFIED
SQUAMOUS
NON
KERATINIZED
EPITHELUIM
 MULTILAYERED EPITHELIUM IN WHICH
BASAL CELLS ARE COLUMNAR.
 EXAMPLE: EPITHELIAL LINING OF
ESOPHAGUS

24. STRATIFIED
SQUAMOUS
NON
KERATINIZED
EPITHELIUM

25. STRATIFIED
SQUAMOUS
KERATINIZED
EPITHELIUM
 MULTILAYERED EPITHELIUM
 TOP MOST LAYER: KERATIN , VIA WHICH
WATER CAN NEITHER BE EVAPORATED
OR nor BE ABSORPED
 EXAMPLE: EPIDERMIS OF SKIN

26. Stratified squamous keratinized epithelium