human anatomy lecture notes 6

Development ameloblasts die after tooth erupts to

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Unformatted text preview: chyme 2. Morphogenesis: After placode sinks, it forms a folded cap (enamel organ that gives rise to ameloblasts that secrete/deposit extracellular enamel). Mesenchyme underneath condenses to form a layer of odontoblasts (secrete/deposit extracellular dentin). Pulp, which forms directly from mesenchym lays beneath the ameloblasts. Lateral to the enamel organ, mesenchyme differentiates to form the the periodontal ligament and the cementum 3. Development: Ameloblasts die after tooth erupts to reveal enamel it produced underneath (thus, no regenerative potential in the enamel) Other Structures that are part of or are associated with the Tooth: Crown:  ­Two parts: Anatomical Crown = portion of tooth entirely covered by enamel; Clinical Crown = enamel above the gingiva (eg. visible portion of tooth)  ­Anatomical crown is surrounded by a collar of 'Junctional Epithelium' from the gingiva that protects against invasion of pathogens (if protection breaks down chronic inflammation occurs in t...
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