Histology Practical Exam

Epithelial tissue
1. strong adhesion between cells
  1. junctional complexes
    1. tight junctions
    2. adhering junctions
    3. communicating junctions
  2. made strong by glycoproteins
2. little intercellular substance
3. cellular sheets cover surfaces
4. forms linings
  1. skin
    1. sensory organ
  2. gut
  3. ducts
    1. secretory organs
5. always supported by basement membrance
  1. characteristic form of extracellular matrix
  2. synthesized by: epithelium & connective tissue
6. Types of epithelia
  1. glandular epithelium
  2. covering epithelium
    1. simple
      1. squamous
        width & depth are greater than height of cell
        not potected from mechanical stresses
        diffusion
        gas - lungs
        fluids - blood capillaries
        endothelium
      2. cuboidal
        ciliated
        square
        surface view is polygonal
        non-ciliated
        square
        surface view is polygonal
      3. columnar
        ciliated
        taller than cuboidal
        Nota:
        right angle to basement membrane
        examples
        Nota:
        female reproductive tract uterus & oviducts bronchi of the lung vasa efferentia
        non-ciliated
        taller than cuboidal
        Nota:
        at right angle to basement membrane
        examples
        Nota:
        highly absorptive surfaces small intestine gall bladder- waterhighly secretory surfacesstomach gall bladder-bile
    2. stratified
      1. Squamous
        keratinizing
        non-keratinizing
      2. cuboidal
        ciliated
        non-ciliated
      3. columnar
        ciliated
        non-ciliated
      4. transitional epithelium
    3. pseudostratified
      1. ciliated columnar
Connective tissue
1. cells that are separated from eachother
2. intervening spaces are occupied by inter-cellular substance formed by connective tissue cells
  1. inter-cellular substance can vary
  2. connective tissue cells can vary
muscle tissue
1. cells are able to contract
  1. fibres
    1. bundles
nervous tissue
1. nerve cells (neurons)
  1. specialized to transmit electric pulses
2. CNS
  1. supporting cells: neuroglia
3. PNS
  1. supporting cells: Schwann cells & satellite cells

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Histology Practical Exam

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