Histology
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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


Body Tissues

  • Four primary types

    • Epithelium

    • Connective tissue

    • Nervous tissue

    • Muscle


Epithelial Tissues

  • Found in different areas

    • Body coverings

    • Body linings

    • Glandular tissue

  • Functions

    • Protection

    • Absorption

    • Filtration

    • Secretion


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


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


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


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.


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


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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