VMED 5126 L1 epithelium

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bekahann2017
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234118
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VMED 5126 L1 epithelium
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2013-09-10 23:00:24
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VMED 5126 L1 epithelium
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VMED 5126 L1 epithelium
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  1. What is the general structural features of epithelium?
    • -sheets: tightly bound contiguous cells
    • -no blood vessels
    • -rich in nerve endings
    • -polarized
  2. sharing a common border; touching
    contiguous
  3. gives rise to the oral and nasal mucosae, cornea, epidermis of the skin, and glands of the skin and the mammary glands.
    ectoderm
  4. The liver, the pancreas, and the lining of the respiratory and gastrointestinal tract are derived from _________________.
    endoderm
  5. The uriniferous tubules of the kidney, the lining of the male and female reproductive systems, the endothelial lining of the circulatory system, and the mesothelium of the  body cavities develop from the ______________ germ layer.
    mesodermal
  6. a layer of extracellular matrix secreted by the epithelial cells, on which the epithelium sits
    basal lamina
  7. Epithelium stands on __________________ which is an extracellular matrix layer between the epithelium and the underlying connective tissue.
    basement membrane (basal lamina)
  8. What does the basement membrane (basal lamina) serve as?
    an underlying support and cushion for epithelium
  9. What are the 3 surfaces each epithelial cell has?
    • 1. Free outer (apical) surface
    • 2. Lateral surface
    • 3. Basal surface
  10. What surface of epithelial cells face the surface of the body or the lumen of internal organs?
    Free outer (apical) surface
  11. Which surface of epithelial cells is cilia and microvilli located (if present)?
    Free outer (apical) surface
  12. What surface of epithelial cells face the adjacent neighboring cells?
    lateral surface
  13. Which surface of epithelial cells is junctional complexes located?
    lateral surface
  14. What are the types of junctional complexes are located on the lateral surfaces of epithelial cells?
    • Tight junctions: occluding junctions
    • Zonulae adherens: adhesive junctions
    • Desmosomes: adhesive junctions
    • Gap junctions: communicating junctions
  15. What surface of epithelial cells face the underlying connective tissues?
    basal surface
  16. Which surface of epithelial cells would hemidesmosomes and membrane infoldings be located?
    basal surface
  17. Epithelial tissue is present in what 2 forms?
    • Covering epithelia
    • Glandular epithelia
  18. Cover mainly the external (skin) and internal surfaces of the body.
    covering epithelia
  19. epithelia lining the blood vessels and lymphatic vessels.
    endothelium
  20. epithelia lining the body cavities
    mesothelium
  21. Epithelia that are specialized for secretion. Actually in-growths of covering epithelium, which descend into the underlying connective tissue.
    Glandular epithelia
  22. Some of the glandular epithelia have kept their connection (through the ______) with the covering epithelium and are specialized as _________________.
    • ducts;
    • exocrine glands
  23. Which epithelia cover the digestive and respiratory tracts?
    covering epithelia
  24. Which epithelia line the pleura, peritoneum and pericardium?
    mesothelium
  25. Glands that delivers their products to the external environment.
    exocrine glands
  26. Some glandular epithelia have become detached from covering epithelia and form _______________.
    endocrine glands
  27. Glands that delivers their products to the blood stream.
    endocrine glands
  28. Epithelial cells found in sensory organs, such as olfactory(nose) and gustatory(taste buds) cells.
    Sensory epithelial cells
  29. Epithelial cells found in seminiferous tubules of testis producing sperm.
    germinal epithelial cells
  30. Epithelial cells found in sweat, salivary, and mammary glands.
    myoepithelial cells
  31. Epithelium originates from what?
    One of three primary embryonic germ layers.
  32. What are the three primary embryonic germ layer that epithelium originates from?
    • ectoderm
    • mesoderm
    • endoderm
  33. The epithelium of the skin is derived from _____________.
    ectoderm
  34. The epithelium lining of the body cavity (mesothelium) and the blood or lymphatic vessels (endothelium) are derived from ______________.
    mesoderm
  35. The epithelium lining the digestive, respiratory or urinary tract is derived from ____________.
    endoderm
  36. What are the functions of epithelium?
    • 1. protection
    • 2. secretion
    • 3. absorption
    • 4. excretion
    • 5. lubrication
    • 6. sensation
    • 7. reproduction
    • 8. contractility
  37. What is the classification of epithelial cells containing only one layer?
    simple epithelium
  38. What is the classification of epithelial cells containing more than one layer, multiple layers?
    stratified epithelium
  39. What is the classification of cells having a flat, thin shape?
    squamous
  40. What is the classification of cells having a truncated hexagonal solid shape with a square profile shape and centrally located nuclei?
    cuboidal
  41. What is the classification of cells having a tall hexagonal solid shape with ovoidal nuclei?
    columnar
  42. Single layer of flat cells.
    simple squamous epithelium
  43. Single layer of cells shaped like truncated hexagonal solids and a square profile shape.
    simple cuboidal epithelium
  44. Single layer of tall cells shaped like hexagonal solids and ovoid nuclei.
    simple columnar
  45. Several layers of cells with the surface-most layer possessing nuclei and flat shaped.
    stratified squamous epithelium (nonkeratinized)
  46. Several layers of cells with the surface-most layer containing dead, non-nucleated and flate in shape.
    stratified squamous epithelium (keratinized)
  47. Multiple layers with the superficial layer comprising of columnar shaped cells.
    stratified columnar epithelium
  48. Appearing to be stratified but actually composed of a single layer of cells. Some are broad and narrow and some are tall and reach the surface but all reach the basal lamina with nuclei located at different levels.
    Pseudostratified columnar epithelium
  49. Several layers of large dome shaped cells that can become flattened and thinner.
    Transitional Epithelium

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