Anatomy & Histology · single question
All of the following are derived from ectomesenchyme (neural crest) EXCEPT:
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Correct answer: D. Buccal mucosal epithelium
- A. Dentin is produced by odontoblasts, which differentiate from the ectomesenchymal dental papilla.
- B. Cementum arises from the dental follicle, which is ectomesenchymal in origin.
- C. Dental pulp is a classic ectomesenchymal derivative — it arises from the dental papilla.
- D. CORRECT — this is the EXCEPTION. The EPITHELIUM lining the buccal mucosa is derived from surface ECTODERM (via the stomodeum), not from ectomesenchyme. Neural crest cells give rise to connective tissue derivatives of the head, but the lining epithelium of the oral cavity is ectodermal.
Note: Enamel = ectoderm (ameloblasts from the enamel organ). Dentin, pulp, cementum, PDL, alveolar bone = ectomesenchyme.
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