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THE EPITHELIAL TISSUE
Prepared by : Reem Aldossari
Lab 2ZOO 103
Structure
•closely packed cells •Specialized to cover external surfaces or line internal cavities.•Epithelial cells are packed tightly together, with almost no intercellular spaces and only a small amount of intercellular substance. •Rest on Basement Membrane
othin sheet of connective tissueoprovides structural support for the epithelium obinds it to neighboring structures
Functions:
•Protection•Permeability•Sensations•Secretions
Types of Epithelial Tissue
•Epithelial tissue can be divided into two groups depending on the number of layers of which it is composes.
simple epithelium: which consist of only one layer
squamous epithelium
cuboidal epithelium
columnar epithelium
StomachIntestineCollecting
tubule
Thyroid gland
Lining of Mouth
Top view
Bowman’s capsule
Side view
stratified epithelium: which consist of more than one
layer
(Squamous,cuboidal,columnar)
Skin of Toad (Frog )
Covering “surface” epithelium .
Glandular epithelium
Neuro_epithium
Types of Epithelial Tissue
•The Simple.•Stratified.
epithelium of cells
specialized to produce secretion.
(Goblet cell)
•Epithelial tissue can be divided into two groups depending on their function of which it is composes.
Simple epithelium
Simple epithelium can be subdivided according to the shape and function of its cells .
Squamous epithelium
•Squamous cells have the appearance of thin, flat plates. •Squamous cells tend to have horizontal flattenednuclei because of the thin flattened form of the cell. •They form the lining of cavities such as the mouth, blood vessels, heart and lungs and
Squamous epithelium
•cuboidal cells are roughly square or cuboidal in shape. •Each cell has a spherical central nucleus. •Cuboidal epithelium is found in •glands •lining of the kidney tubules •ducts of the glands
Simple Cuboidal Epithelium
•The cells are elongated and column-shaped. •The nuclei are elongated and are usually oval and basal. •Columnar epithelium forms the lining of the stomach and intestines.
Simple Columnar Epithelium
•Glandular Epithelium: epithelium of cells specialized to produce secretion. All glands are of composed of epithelium.•columnar and cuboidal epithelial cells.
Glandular Epithelium
1
2
Under The Microscope
Simple Squamous Epithelium ( Lining of mouth )
1- Cell membrane
2- Cytoplasm
3- Nucleus
12
3
Simple Cuboidal Epithelium
1-Nucleus
2-Basement membrane
3-Cuboidal cell
4-Collecting Tubules
24
31
T.S of (collecting tubule (in the
kidney
T.S of Thyroid gland
Simple Columnar Epithelium
1-Nucleus
2-Plasma membrane
3-Basement membrane
1
3
2
T.S of intestine
Epithelium tissues (Goblet cells )
1-Goblet cells
2-Villi
1
2
Thank you for your attention