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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
