1. Cells and Tissues  Cells =  Tissues = Ch. 4 Tissue: The Living Fabric

2. 4.1 Types of Tissues A. Four primary types :  Epithelial  Connective  Muscle  Nervous B. Embryonic Origin of Tissues  Ectoderm  Mesoderm  Endoderm

3. ** Tissue Membranes after 4 tissues ** C.Cell to Cell Junctions (was under Epithelial Tissues) 1.Tight 2. Anchoring 1.Gap

4. 4.2 Epithelial Tissues  General Locations  Boundaries:  Glands  Lab Clue: Space  Characteristics  General Structure:  Cell Polarity:  apical surface  basal surface  Basement membrane:  Basal lamina  Reticular lamina  Functions

5. 4.2 Epithelial Tissues A. General Locations  Boundaries:  Glands B. Characteristics  Cell Density  Matrix  Cell Polarity:  apical surface  basal surface  Basement membrane:  Basal lamina glycoproteins and collage  Reticular lamina  Avascular  Mitosis Apical Surfaces Basal Surface

6. C. Classification of Epithelium 1.Layers  Simple:  Stratified: Figure 3.17a

7. Classification of Epithelia … 2. Shape of cells  Squamous  Cuboidal  Columnar  Stratified cell shape Figure 3.17b

8. D. SPECIFIC TYPES 1. Simple Squamous Epithelia – - Locations - Functions Figure 3.18a SPECIAL TYPES Endothelium – inner covering of heart, lymph, and blood vessels Mesothelium – epithelium of serous membranes Alveoli of Lungs

9. Simple Squamous Epithelium in the Kidney Glomeruli Glomeruli of Kidneys

10. 2. Simple Cuboidal Epithelia - Locations - Functions Central nucleus

11. Simple Cuboidal- in the Kidneys

12. 3. Simple Columnar Epithelia – Locations: Functions: Structural Specializations - Goblet cells (see next slide) - Microvilli

13. Simple Columnar in Small Intestine Lining (showing Microvilli & Goblet Cell) Goblet Cell w/ mucusMicrovilli

14. 4. Pseudostratified Columnar Epithelia – - Structure - Location - Function

15. Pseudostratified ciliated columnar inside trachea Cilia Goblet Cells

16. 5. Stratified Squamous Epithelia Types: keratinized and non-keratinized Location Function Basal Cells Top cells Non-keratinized (Non-keratinized)

17. Keratinized Stratified Squamous Epithelium

18. 6. Stratified cuboidal and columnar epithelia  RARE  Stratified cuboidal  Stratified columnar

19. 7. Transitional Epithelia - Structure - Locations - Functions

20. E. Glandular Epithelium: gland =  Endocrine gland  Exocrine gland

21. E. Glandular Epithelium … 1. Classification: # cells  Unicellular  Goblet cells  Multicellular

22. E. Glandular Epithelium … 2. Class… Multicellular by complexity  Simple  Compound: 3. Classification by what is secreted:  Mucous  Sweat,  Oil  Salivary glands

23. 4. Modes of Secretion  Merocrine  Exocytosis  Apocrine  Holocrine

24. END

25. Review Question 4. Epithelium tissue with multiple layers of flat cells are known as __________________________. If the cells attached to the basal membrane are cuboidal but the cells on the apical surface are flat, the tissue is called _________________________.

26. Review Questions 5a. List 2 functions of simple squamous epithelium. 5b. List 1 function of stratified squamous epithelium.

27. Review Questions 1a.What are the 6 major functions of epithelial tissues? Do all epithelial tissues carry out all of these functions? 1b.What type of ET is shown here?

28. Review Question 2. Fully describe the gland below: endocrine or exocrine? Simple or compound? Merocrine or Holocrine?