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Histology - PowerPoint PPT Presentation


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Histology. What is Histology?. Histology is the study the structure and function of normal mammalian cells and tissues using various types of microscopes. What is …..? . A cell? Luckily, most of you can answer this Functional unit of all living organisms A tissue?

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Presentation Transcript
what is histology
What is Histology?
  • Histology is the study the structure and function of normal mammalian cells and tissues using various types of microscopes.
what is
What is …..?

A cell?

    • Luckily, most of you can answer this
    • Functional unit of all living organisms
  • A tissue?
    • A group of cells and surrounding material
    • Includes fibers, liquid or gelatinous material
      • Provides support
how can we see tissues
How can we see tissues?
  • Tissues make up all the organs in the body, including skin, but to see the details of the cells and fibers we need to do a few things.
making a microscope slide
Making a microscope slide
  • Cut a sample from an organism
  • Fix it with special chemicals
  • Permeate it with wax
  • Slice the wax into thin sections
  • Stain the sample with colorful stains
  • Place on the microscope and view
epithelia
Epithelia
  • Covers and lines cavities of the body
  • Thin cells are good for gas and nutrient exchange
  • Thicker cells are good at absorbing and secreting
epithelia continued
Epithelia, continued
  • All cells connect together to form a sheet if they are a covering or lining epithelia
  • All glands that secrete hormones and other major proteins for the body are also made of epithelia
connective tissue
Connective Tissue
  • 3 elements
    • Cells
    • Fibers
    • Ground substance
    • In varying proportions
    • Most diverse tissue type
where it all begins
Where it all begins
  • Mesenchyme
  • From the mesoderm
  • Found in the umbilical cord after delivery
  • Source of connective tissue stem cells.
connective tissue includes
Connective Tissue includes:
  • Blood
  • The dermis
  • Cartilage
  • Tendons
  • Bone
  • Space fillers in organs
  • Fat
muscle
Muscle
  • Three types
neuromuscular junction
Neuromuscular Junction
  • Where axons of neurons meet skeletal muscle
  • This connection is blocked by BOTOX
nervous tissue
Nervous Tissue
  • Spinal cord
  • Brain
  • Peripheral Nervous Tissue
support cells of the nervous sytem
Support cells of the nervous sytem
  • Glial cells
    • in the spinal cord and brain
    • Primarily in the white matter
  • Schwann cells
    • Elsewhere in the body
    • Myelination
      • A special form of insulation
poliomyelitis
Poliomyelitis
  • Virus
  • Attacks anterior horn cells of spinal cord
    • lower motor neurons
  • Paralysis of associated skeletal muscle
  • Microglia
    • engulf virus
    • destroyed cells,
    • dark staining areas