Oral Biology 2 - W01

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Author:
lestona
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228933
Filename:
Oral Biology 2 - W01
Updated:
2013-08-02 06:14:13
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dentistry oral biology
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Revision form lecture notes.
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  1. 4w.i.u Embryo (2)
    - nervous development occurs, followed by tooth development

    - NEURAL CREST CELLS (ectoderm) appear during CNS development
  2. 5-6w.i.u Embryo (2)
    • - primitive oral cavity (STOMODEUM) forms close to the heart
    • - embryo is formed of three GERM LAYERS (ecto/meso/endo-derm)

  3. Neural Crest Cells (5)
    • - ECTODERM
    • - MIGRATE from dorsal surface to mesenchyme of stomodeum
    • - mesenchyme becomes ectomesenchyme
    • - DIFFERENTIATE into other cells (a -> a + b, like stem cells)
    • - send SIGNALS to neighbouring tissues
  4. Stomodeum (2)
    • - primitive oral cavity
    • - lined by ectoderm (two layers of BASAL COLUMNAR and SUPERFICIAL FLAT cells)

  5. Three Germ Layers (4)
    • - ECTODERM (external lining, anything we can touch, eg. enamel, oral cavity, cornea, hair, skin)
    • - MESODERM (intermediate lining, eg. blood, cartilage, bone, ligaments, muscle)
    • - ENDODERM (internal lining, eg. digestive system)
    • - all oral structures form from ECTODERM (mesoderm CT -> basement membrane -> ectoderm basal columnar and superficial flat cells become epithelium) and MESENCHYME

  6. Branchial Arches Development (4)
    • - at 3w.i.u, embryo is flattened dorso-ventrally
    • - 6 pairs of projections extend laterally   
    • - arches form cartilage, nerves, muscles and arteries in foetus
    • - each arch has one source of nerve and blood supply (nerve supply of different structures correlates with their developmental origin)

  7. Branchial Arches Anatomy (5)
    • - six arches, but five fuses to six
    • - lined by ectoderm on outside, endoderm on inside and mesoderm in between (except first arch, ectoderm on inside and outside)     
    • - branchial pouch forms at endoderm fold (inside)   
    • - branchial cleft forms at ectoderm fold (outside)
    • - first arch has two clefts, instead of one each

  8. Branchial Arch Names, Nerve Supply and Derivatives (2) and (10)
    • 1. Mandibular (mandibular nerve)
    • 2. Hyoid (facial nerve)

    • Derivatives of Mandibular Arch
    • 1. mandible and maxilla
    • 2. lower lip, part of the upper lip and cheek
    • 3. all teeth
    • 4. all salivary glands
    • 5. all muscles of mastication
    • 6. anterior two thirds of the tongue

    • Remnants of Meckel's Cartilage (in centre of branchial arch)
    • 7. incus and malleus
    • 8. lingual of the mandible
    • 9. mental ossicles (genial tubercles)
    • 10. sphenomandibular ligament (waterproof, must penetrate to numb)

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