HISTOLOGY Study of Body Tissues 4 types A

HISTOLOGY § Study of Body Tissues § 4 types: A. Epithelial tissue B. Connective tissue C. Muscle tissue D. Nervous tissue Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

EPITHELIAL TISSUE Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

Classification of Epithelia 1. Number of cell layers § Simple—one layer § Stratified—more than one layer Figure 3. 17 a Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

2. Shape of cells § Squamous – flattened § Cuboidal --cube-shaped § Columnar -- column-like Figure 3. 17 b Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

Special Characteristics of Epithelium 1. Tightly packed together 2. Regenerate at high rate ! 3. Non-vascular Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

Types of Epithelial Tissue 1. Simple squamous -- single layer of flat cells § lines body cavities, lungs, capillaries Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

2. Simple cuboidal-- single layer of cube-like cells Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

3. Simple columnar - single layer of tall cells with mucus-producing goblet cells Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

4. Stratified squamous – multiple layers of flat cells § protective covering where friction is common Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

5. Transitional epithelium = “stretchy” tissue Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings