Anatomy & Histology · single question
Which of the following is NOT a derivative of ectomesenchyme?
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Correct answer: A. Oral mucosa (epithelium)
Oral mucosa epithelium is derived from oral ectoderm, NOT ectomesenchyme. Ectomesenchyme (neural crest-derived) forms pulp, dentin, cementum, PDL, and alveolar bone.
- A. ✅ CORRECT – Oral epithelium is derived from oral ectoderm, NOT ectomesenchyme.
- B. ❌ Dentin IS derived from ectomesenchyme (dental papilla odontoblasts).
- C. ❌ Pulp IS derived from ectomesenchyme (dental papilla).
- D. ❌ Cementum IS derived from ectomesenchyme (dental follicle).
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