Epithelial Tissues

Front 1

Squamous epithelium

Back 1

Cell- thin, flattened, little cytoplasm, disc shaped nuclues

Margin- tessellated ( irregular)

Function:

1. Permits diffusion

2. Provide smooth lining to hollow structure

Distribution:

1. Bowman' s capsule

2. Alveolar lining

3. Blood capillary

Front 2

Cubical

Back 2

Cell- cube shaped, spherical nucleus

Function:

1. Line the duct

Distribution:

1. Lining of many ducts

Front 3

Columnar

Back 3

Cell- tall, narrow, nucleus at basal end

May have goblet cells

Microvilli at free surface ends in some cells

Function:

Lines and protects( mucus)

Distribution:

1. Lining of stomach and intestine, kidney ducts

Front 4

Ciliated

Back 4

Columnar shaped but bear cilia at free end

Function:

Move materials

Distribution:

Lining of oviducts , respiratory passages

Front 5

Pseudostratified

Back 5

Looks like several different levels but still one layer cell thick

Function:

Sdcretion and absorption

Distribution:

Lining of urinary tract, trachea

Front 6

Stratified

Back 6

Numerous layers of cells

Function:

Protect against mechanical damage or abrasion

Distribution:

Lining of oesophagus, mouth and vagina

Front 7

Transitional

Back 7

3 to 4 layers of similar size but flattened at free end

Maybe cornified( keratin)

Function:

Allow surface to be distended( streched)

Distribution:

Lining of urinary bladder