1. Anatomy and Physiology, Sixth Edition
Rod R. Seeley Idaho State University
Trent D. Stephens Idaho State University
Philip Tate Phoenix College
Chapter 04
Lecture Outline*
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2. Histology: The Study of Tissues
Chapter 4
Histology: The Study of Tissues

3. Tissues and Histology Tissue Level of Organization
Epithelial
Connective
Muscle
Nervous
Histology: Microscopic Study of Tissues

4. Embryonic Tissue Germ layers Endoderm Mesoderm Ectoderm Inner layer
Forms lining of digestive tract and derivatives
Mesoderm
Middle layer
Forms tissues as muscle, bone, blood vessels
Ectoderm
Outer layer
Forms skin and neuroectoderm

5. Epithelium Characteristics
Consists almost entirely of cells
Covers body surfaces and forms glands
Has free and basal surface
Specialized cell contacts
Avascular
Undergoes mitosis

6. Functions of Epithelia
Protecting underlying structures
Acting as barriers
Permitting the passage of substances
Secreting substances
Absorbing substances

7. Classification of Epithelium
Simple
Squamous, cuboidal, columnar
Stratified
Pseudostratified
columnar
Transitional
Cuboidal to columnar when not stretched and squamouslike when stretched

8. Types of Epithelium

9. Types of Epithelium

10. Types of Epithelium

11. Types of Epithelium

12. Types of Epithelium

13. Types of Epithelium

14. Types of Epithelium

15. Types of Epithelium

16. Functional Characteristics
Cell layers and shapes
Diffusion, Filtration, Secretion, Absorption, Protection
Cell surfaces
Microvilli: Increase surface area absorption or secretion
Cilia: Move materials across cell surface
Cell connections
Desmosomes, tight, gap
Glands
Exocrine: Have ducts
Endocrine: Have no ducts

17. Cell Connections Functions Types Bind cells together
Form permeability layer
Intercellular communication
Types
Desmosomes
Tight
Gap

18. Interesting, right?
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