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Tissues. Epithelial Tissue. Tissues. A group of similar cells that work together to perform a specific function. Four main types of tissues: Epithelial Connective Muscular Nervous All cells present in a tissue are surrounded by/bathed in an extracellular matrix (ECM)

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Tissues


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tissues

Tissues

Epithelial Tissue

tissues1
Tissues
  • A group of similar cells that work together to perform a specific function.
  • Four main types of tissues:
    • Epithelial
    • Connective
    • Muscular
    • Nervous
  • All cells present in a tissue are surrounded by/bathed in an extracellular matrix (ECM)
    • ECM-nonliving material (no cells), usually fluid (but can be solid), produced by the cells it surrounds.
epithelial tissue
Epithelial Tissue
  • Widespread through out the body, present in every body system.
  • Very diverse cell types compose it (9 types)
  • Avascular-no blood vessels present
  • Very little ECM present
  • Are usually able to repair themselves and/or regenerate through the life span
  • Located on the outside of the body, on the outside of the organs, lining hollow spaces inside organs and lining body cavities.
  • Function to provide sensation, protect, absorb substances, secrete substances (produce) and excrete substances (eliminate).
  • Common for intercellular connections to be present.
intercellular connections
Intercellular Connections
  • Many epithelial tissues have specialized connections between the individual cells.
  • Connections are protein structures (3 Types)
    • Desmosomes: Anchor adjacent cells to one another.
        • Help keep epithelial tissue in tact.
slide5

2. Tight junctions: fuse cell membranes at intermittent spots

  • Allow for more rapid diffusion of substances between cells.
slide6

3. Gap junctions: tubular channels between cells

  • Also allow for more rapid diffusion of substances.
distinct features of all epithelial tissues
Distinct features of ALL epithelial tissues…
  • Basement Membrane: nonliving material that anchors the epithelial tissue to the underlying tissue. Free surface/lumen

Epithelial cells

Basement Membrane

Underlying tissue

slide9

2. Free surface: Open space on the side/edge of the ET.

  • Also called the lumen when it is inside organs/cavities
types of epithelial
Types of Epithelial
  • Nine types
  • Classified according to the shape of cell and the number of cell layers present in the tissue.
  • Name consists of two parts, the Part1-Indicates the number of cell layers

Part 2-Indicates the shape of the cells.

1 cell layer simple
1 Cell Layer: Simple
  • Simple Squamous
    • Squamous: flat/squashed
  • Simple Cuboidal
    • Cuboidal: cubes
  • Simple Columnar
    • Columnar: columns
      • Could have microvilli or cilia on free

surface.

      • Goblet cells-are secreting cells
2 or more cell layers stratified
2 or More Cell Layers: Stratified
  • Stratified Squamous
    • Squamous: squashed cells at free surface
  • Stratified Cuboidal
    • Cuboidal: many times only 2-3 layers thick
  • Stratified Columnar
    • No cilia or microvilli
slide13

Pseudostratified Columnar Epithelium

    • Abbrev. Pseudostartfied
    • Looks like more than one cell layer but it’s not
  • Stratified Transitional Epithelium
    • A type of stratified epithelium
    • Tissue stretches & cells at free surface change shape.
      • Distended= stretched tissue
slide14

Glandular Epithelium

    • Classified because of function
    • Could be simple cuboidal, simple columnar, stratified cuboidal, stratified columnar or pseudostratified.
    • Specialized to secrete
    • Are endocrine glands or exocrine glands
what type of et do you see1
What type of ET do you see?
  • Stratified squamous
what type of et do you see2
What type of ET do you see?
  • Simple columnar (ciliated)