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Histology. Study of tissues. Tissue is a group of cells with common origin and function. Matrix. Composition of Tissue:. 1. Cells 2. Fibers ( formed intercellular material) 3. Amorphous ground substance. Body Tissues. Four primary types Epithelium Connective tissue Nervous tissue

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histology
Histology

Study of tissues.

Tissue is a group of cells with common origin and function.

Matrix

Composition of Tissue:

  • 1. Cells
  • 2. Fibers (formed intercellular material)
  • 3. Amorphous ground substance
slide2

Body Tissues

  • Four primary types
    • Epithelium
    • Connective tissue
    • Nervous tissue
    • Muscle
slide4

Epithelial Tissues

  • Found in different areas
    • Body coverings
    • Body linings
    • Glandular tissue
  • Functions
    • Protection
    • Absorption
    • Filtration
    • Secretion
slide5

Epithelium Characteristics

  • Cells fit closely together
  • Tissue layer always has one free surface
  • The lower surface is bound by a basement membrane
  • Avascular (have no blood supply)
  • Regenerate easily if well nourished
slide6

Classification of Epithelium

  • Number of cell layers
    • Simple – one layer
    • Stratified – more than one layer
  • Shape of cells
    • Squamous – flattened
    • Cuboidal – cube-shaped
    • Columnar – column-like
slide7

Connective Tissue

  • Found everywhere in the body
  • Includes the most abundant and widely distributed tissues
  • Functions
    • Binds body tissues together
    • Supports the body
    • Provides protection
slide8

Connective Tissue Characteristics

  • Variations in blood supply
    • Some tissue types are well vascularized
    • Some have poor blood supply or are avascular
  • Extracellular matrix
    • Non-living material that surrounds living cells
glands
Glands

Gland – one or more cells that secretes a particular product

Endocrine glands

Endo = inside

Crine = to secrete

Exocrine glands

Exo = outside

Crine = to secrete

endocrine glands
Endocrine Glands

Secrete hormones

No duct

Secrete directly into body fluids

Exocrine Glands

  • Secrete to outside of body
  • Always have a duct
  • Secrete onto a surface
  • Secrete tears, saliva, milk, etc.
slide11

Types of Tissue Repair

  • Regeneration
    • Replacement of destroyed tissue by the same kind of cells
  • OR
  • Fibrosis
    • Repair by dense fibrous connective tissue (scar tissue)
  • Determination of method
    • Type of tissue damaged
    • Severity of the injury
slide12

Events in Tissue Repair

  • Capillaries become very permeable
    • Introduce clotting proteins
    • Wall off injured area
  • Formation of granulation tissue
  • Regeneration of surface epithelium
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