Classification of Tissues: Epithelial Tissue

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Presentation transcript:

Classification of Tissues: Epithelial Tissue Tissue: a collection of similar cells working together Epithelial Tissue: cells that cover the surfaces of organs or form a lining within a cavity Turn to: page 56 of the lab book and page 12-14 of the lab packet

Apical surface: the very top surface of epithelial tissue Basement membrane (basal surface): the very bottom surface of epithelial tissue Lumen: The open space above the apical surface of a structure Apical Surface LUMEN Epithelial Tissue Connective Tissue (another type of tissue; Always found supporting the basement membrane) Basement Membrane

Lumen: The inner open space or cavity of a tubular organ, as of a blood vessel or an intestine. Apical Surface Connective Tissue LUMEN Epithelial Tissue Basement Membrane

Classification of Epithelia 1. Number of cell layers

2. Shape of the cells

I will use BOTH microscopes AND histograms to test you on epithelial tissues. Make sure you look at the microscopes in lab and the histograms in this presentation.

Simple Squamous Epithelia Alveoli (air sacs) of Lungs

Page 56

Simple Squamous Epithelium

Simple Squamous Epithelia

Simple Squamous Epithelium

Simple Cuboidal Epithelia Kidney Tubules

Page 56 Apical surface

Simple Cuboidal Epithelium Connective Tissue Apical Surface L L L L L L L Basement Membrane

Simple Cuboidal Epithelium

Simple Cuboidal Epithelium

Simple Columnar Epithelium Small Intestine Small Intestine Cross Section

Simple Columnar Epithelium Lumen L

Simple Columnar Epithelium Apical surface Basement membrane Connective Tissue

Goblet Cells (mucus producing cell) Magnified!!! Goblet Cells

Simple Columnar Epithelia: pointer is on the basement membrane

Simple Columnar Epithelia: pointer is on a goblet cell

Stratified Squamous Epithelia Skin Mouth & Esophagus

Page 58 Apical surface Lumen

Stratified Squamous Epithelium LUMEN

Stratified Squamous Epithelium LUMEN

Stratified Squamous Epithelium

Transitional Epithelia Urinary Bladder Lumen Lumen

Page 59

Transitional Epithelium LUMEN

Transitional Epithelia

Transitional Epithelia: pointer is on the basement membrane

Pseudostratified Ciliated Columnar Epithelia Lumen Trachea

Page 57

Pseudostratified Ciliated Columnar Epithelium LUMEN Cilia

Pseudostratified Ciliated Columnar Epithelia

Pseudostratified Ciliated Columnar Epithelia