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Anatomy & Histology · single question

All of the following dental hard/soft tissue structures derive from ectomesenchyme (cranial neural crest origin) EXCEPT:

  1. The dental pulp and dentin (odontoblasts)
  2. The periodontal ligament and cementum
  3. Oral mucosal epithelium (which is derived directly from surface ectoderm, not ectomesenchyme)
  4. The dental papilla-derived structures generally
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Correct answer: C. Oral mucosal epithelium (which is derived directly from surface ectoderm, not ectomesenchyme)

Ectomesenchyme (derived from cranial neural crest cells) gives rise to the dental pulp, dentin (via odontoblasts), cementum, and periodontal ligament. Oral mucosal epithelium, by contrast, is derived directly from surface ectoderm (the same germ layer source as enamel-forming ameloblasts), not from ectomesenchyme.

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