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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

Lab 2ZOO 103

THE EPITHELIAL TISSUE

Prepared by : Reem Aldossari

slide2

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
slide3

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

slide4

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.
slide5

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
slide7

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
slide8

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.
slide9

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

slide11

1

2

3

Simple SquamousEpithelium ( Lining of mouth )

1-Cell membrane

2- Cytoplasm

3-Nucleus

slide12

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

slide13

2

1

3

T.S of intestine

Simple Columnar Epithelium

1-Nucleus

2-Plasma membrane

3-Basement membrane

slide14

2

1

Epithelium tissues (Goblet cells )

1-Goblet cells

2-Villi

slide15

Thank you

for your attention