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THE EPITHELIAL TISSUE

Lab 2 ZOO 103. THE EPITHELIAL TISSUE . Prepared by : Reem Aldossari. Structure . closely packed cells Specialized to cover external surfaces or line internal cavities.

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THE EPITHELIAL TISSUE

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  1. Lab 2ZOO 103 THE EPITHELIAL TISSUE Prepared by : Reem Aldossari

  2. 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 • thin sheet of connective tissue • provides structural support for the epithelium • binds it to neighboring structures Functions: • Protection • Permeability • Sensations • Secretions

  3. 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 stratified epithelium: which consist of more than one layer squamous epithelium columnar epithelium cuboidal epithelium Thyroid gland Collecting tubule Intestine Stomach ( Squamous,cuboidal,columnar) Skin of Toad ( Frog ) Bowman’s capsule Side view Lining of Mouth Top view

  4. Types of Epithelial Tissue • Epithelial tissue can be divided into two groups depending on their function of which it is composes. • Neuro_epithium Glandular epithelium • Covering “surface” epithelium. • epithelium of cells specialized to produce • secretion. • (Goblet cell) • The Simple. • Stratified.

  5. 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

  6. Squamous epithelium

  7. Simple Cuboidal 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

  8. Simple Columnar 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.

  9. Glandular Epithelium 2 • Glandular Epithelium: epithelium of cells specialized to produce secretion. All glands are of composed of epithelium. • columnar and cuboidal epithelial cells. 1

  10. Under The Microscope

  11. 1 2 3 Simple SquamousEpithelium ( Lining of mouth ) 1-Cell membrane 2- Cytoplasm 3-Nucleus

  12. 3 1 4 2 T.S of (collecting tubule (in the kidney T.S of Thyroid gland Simple Cuboidal Epithelium 1-Nucleus 2-Basement membrane 3-Cuboidal cell 4-Collecting Tubules

  13. 2 1 3 T.S of intestine Simple Columnar Epithelium 1-Nucleus 2-Plasma membrane 3-Basement membrane

  14. 2 1 Epithelium tissues (Goblet cells ) 1-Goblet cells 2-Villi

  15. Thank you for your attention

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