Classification of Tissues: Epithelial Tissue Tissue: a collection of similar cells working together...

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 tissueBasement membrane (basal surface): the very bottom surface of epithelial tissueLumen: The open space above the apical surface of a structure

Epithelial Tissue

Apical Surface

Connective Tissue(another type of tissue;Always found supporting the basement membrane)

Basement Membrane

LUMEN

Lumen: The inner open space or cavity of a tubular organ, as of a blood vessel or an

intestine.

Basement Membrane

LUMEN

Apical SurfaceConnectiveTissue

EpithelialTissue

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 EpitheliaAlveoli (air sacs) of Lungs

Page 56

Simple Squamous Epithelium

L

L

L

L

LLL L

L

Simple Squamous Epithelia

Simple Squamous Epithelium

Simple Cuboidal EpitheliaKidney Tubules Kidney Tubules

Apicalsurface

Page 56

Simple Cuboidal Epithelium

L

L

L

LL

L

L

Basement Membrane

Apical SurfaceConnectiveTissue

Simple Cuboidal Epithelium

L

L

L

Simple Cuboidal Epithelium

Simple Columnar Epithelium

Small Intestine

Small IntestineCross Section

Simple Columnar Epithelium

L

L

Lumen

Simple Columnar Epithelium

Apicalsurface 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

Apicalsurface Lumen

Page 58

LUMEN

Stratified Squamous Epithelium

LUMEN

Stratified Squamous Epithelium

Stratified Squamous Epithelium

Transitional EpitheliaUrinary Bladder

LumenLumen

Page 59

LUMEN

Transitional Epithelium

Transitional Epithelia

Transitional Epithelia: pointer is on the basement membrane

Pseudostratified Ciliated Columnar Epithelia

TracheaLumen

Page 57

Pseudostratified Ciliated Columnar Epithelium

Cilia

LUMEN

Pseudostratified Ciliated Columnar Epithelia

Pseudostratified Ciliated Columnar Epithelia