Embryology Chapter nine

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sthomp88
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44690
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Embryology Chapter nine
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2010-12-06 01:56:35
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Embryology Chapter nine oral mucosa
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Oral mucosa 1
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  1. The tissue that lines the oral cavity
    Oral mucosa
  2. Three layers of the oral mucosa
    • epithelium
    • basement membrane
    • lamina propria
  3. New name for connective tissue; it has the same layers, but now they have new names, and a few more details
    lamina propria
  4. Loose connective tissue with "papilla" - finger like projections into the overlying epithelium which increase the surface area
    Papillary layer
  5. capillary system that runs between the two layers and sends more capillaries up into each papilla
    Capillary plexus
  6. dense connective tissue layer of the lamina propria
    dense layer
  7. may or may not be present deep to the dense layer. It can be adipose tissue (most common), saliva glands, or muscle
    submucosa
  8. the layer that the connective tissue of the oral mucosa connects directly to if the submucosa is not present
    mucoperiosteum covering the bone
  9. Order of tissue of the oral mucosa from superficial to deep layers:
    • epithelium
    • basement membrane
    • lamina propria:
    • papillary layer
    • capillary plexus
    • dense layer
    • submucosa or mucoperiosteum if submucosa is not present
  10. 3 classifications of oral mucosa:
    • lining mucosa
    • masticatory mucosa
    • specialized mucosa
  11. softer surface texture, moist and able to stretch, compress
    lining mucosa
  12. rubbery surface texture and resilient (not stretchy)
    masticatory mucosa
  13. lingual papillae
    specialized mucosa
  14. found in the lining mucosa, most common type of epithelium in the oral cavity, and consists of new layers
    nonkeratinized stratified squamous epithelium
  15. What are the layers from deep to superficial of the nonkeratinized stratified squamous epithelium?
    • basal layer
    • intermediate layer
    • superficial layer
  16. Deepest layer of the nonkeratinized stratified squamous epithelium. A single layer of cells that sit above the basement membrane and have two functions, which are: produce the lamina lucida of the basement membrane; and produce new epithelial cells by mitosis - no more mitosis occurs once you leave this layer
    Basal layer
  17. Middle layer of nonkeratinized stratified squamous epithelium. Cells have migrated superficially from the basal layer; this layer makes up the bulk of the epithelium
    intermediate layer
  18. top layer of nonkeratinized stratified squamous epithelium. Cells have continued to migrate and they've gotten flatter as they move up. Now they are squames. They die and are shed from the tissue
    superficial layer
  19. What are the layers of the orthokeratinized stratified squamous epithelium from deep to superficial?
    • Basal layer
    • prickle layer
    • granular layer
    • keratin layer
  20. epithelium found in the masticatory mucosa. It is the least common in the oral cavity.
    orthokeratinized stratified squamous epithelium
  21. deepest layer of the orthokeratinized stratified squamous epithelium. a single layer of cells lying above the basement membrane, it produces that lamina lucida of the basement membrane, and produces new epithelial cells by mitosis, there is no more mitosis once you leave this layer
    basal layer
  22. similar to the intermediate layer. When you dry it out (to look under a microscope), the cells shrink, but maintain their desmosomes. This layer makes up the bulk of the orthokeratinized stratified squamous epithelium
    prickle layer
  23. similar to the intermediate layer. In these cells, we see the keratohyaline granules that will eventually keratinize the cell in orthokeratinized stratified squamous epithelium
    granular layer
  24. similar to the superior layer. They've migrated to the top, flattened out, and filled with keratin, so they have NO NUCLEI. The keratin cells die and are shed from the tissue. most superficial layer in the orthokeratinized stratified squamous epithelium.
    keratin layer
  25. found in the masticatory mucosa. More common than orthokeratinized tissue. This is exactly the same as orthokeratinized stratified squamous epithelium, except the keratin cells HAVE NUCLEI. They are on their way to loose the nucleus, but they are shed before they do.
    Parakeratinized stratified squamous epithelium
  26. Name 3 different types of epithelium of the oral mucosa
    • nonkeratinized stratified squamous epithelium
    • orthokeratinized stratified squamous epithelium
    • parakeratinized stratified squamous epithelium
  27. The tall narrow papilla pulling on the epithelium. Means gums are very healthy. It looks kind of like an orange peal
    stippling
  28. the scalloped division between the attached gingiva and the alveolar mucosa
    mucogingival junction
  29. very normal pigmentation. Just like the melanin that gives your skin color, it can give color to the oral mucosa. More common in patients with darker skin (more melanin)
    melanin pigmentation
  30. Turn over time for oral mucosa is _________/
    quick
  31. ____________- repairs epithelium. ______________- repairs connective tissue.
    • blood clot
    • granulation tissue
  32. true or false. too much granulation tissue can get in the way and cause problems, so you may have to remove it.
    true
  33. 5 types regions of the oral cavity where lining mucosa is found
    • labial/buccal mucosa
    • alveolar mucosa
    • floor of mouth
    • ventral tongue
    • soft palate
  34. 2 regions of the oral cavity where masticatory mucosa is found
    • attached gingiva
    • hard palate

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