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Tissue
A group of closely associated cells working toward a common goal
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Types of Epithelial tissue
- 1. Covering and lining
- 2. Glandular
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Glandular Tissue
Epithelial tiusse that forms glands of the body
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Covering and lining Tissue
- on the free suface of the body
- associaged with skin and ventral cavity membrane
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Special characteristics of Epithelial tissue
- 1. Cellularity
- 2. Specialized contacts
- 3. Polarity
- 4.Supported by connective tissue
- 5. Avascular but innervated
- 6. Regeneration
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Epithelial tissue Cellulartiy Characteristic
consists of closely packed cells
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Epithelial tissue Specialized contacts
cells fit together for form sheets
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Epithelial tissue Polarity
- posses two different surfaces
- 1. Apical surface
- 2. Basal surface
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Apical polar surface
- upper (free) exposed surface
- always facing something like organ
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Basal Polarity Surface
- lower attached surface
- sits on connective tissue
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Epithelial supported by connective tissue
which typically have good blood supply
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Epithelial tissue avasular but innervated
- No blood supply
- Good nerve supply
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Epithelial Regeneration
high rate of cell division
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Classification of Epithelia
- 1. Shape
- 2. Number of layer
- 3. Glandular
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Epithelia cell shape classification
- 1.Squamous
- 2.Cuboidal
- 3. Columnar
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Epithelia cell shape Squamous
- thin and flat
- looks like a fried egg
- easliy manipulated
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Epithelia cell shape Cuboidal
shaped like tiny sugar cubes
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Epithelia cell shape Columnar
- shaped like tiny columns
- has microvilli
- typically nucleus on bottom
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Epithelial number of layers Classification
- 1. Simple epithelia
- 2. Stratified epithelia
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Classification of layer Simple epithelia
- 1. Simple squamous
- 2. Simple cuboidal
- 3. Simple Columnar/Pseudostratified Columnar
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Simple squamous cells
- areas of diffusion-lungs
- sheet rapped in a circle (ex. around an air sac)
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SImple cuboidal Classification of layer
- not tall
- not flat
- glands and ducts
- looks like a circle of cells around a gland or a duct, outside the circle is connective tissue or other cells
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Simple columnar Classification of layer
- 1.Goblet cells the produce mucus (lube)
- 2. Microvilli to increase surface area (digestion)
- 3. Cilia to move things (resptory system)
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Pueudostratified columar Classification of layers
- Simple= one row
- many times all you can see in the nucleus
- barriers can be hard to see
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What defines cell
outter most layer
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Classification of layers Stratified epithelia
two or more layers of cells, named for the shape of its outter layer
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Different Classifications of Stratified epithelia
- 1. Stratified Squamous
- 2. Stratified Cuboidal
- 3. Stratified columnar
- 4. Transitional
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Stratified squamous
- protetive areas
- 20-30 rows
- more blood supply is at basal level than apical level
- top row of cells mostly dead, hair and skin
- found in Tonge, Mouth, and Pharynx (throat)
- KERATINIZED
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Keratinized (stratified squamous)
- Contains keratin
- waterproofing or resistant
- skin ONLY
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Stratified cuboidal
- rare
- typically only two layers deep
- look for large duct
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Stratified Columnar
- Rare
- a few rows at most 3 layers
- digestive tract
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Transitional (stratified)
- allows stretching
- dome shaped
- BLADDER
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