Anatomy & Histology · single question
Which of the following is NOT a mesenchymal derivative?
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Correct answer: A. Mucosa (oral epithelium)
Oral mucosa/epithelium (A) is NOT a mesenchymal derivative. Oral epithelium is derived from ectoderm (or endoderm in the posterior oral cavity).
Mesenchymal derivatives include:
• Bone ✓ (ossification of mesenchyme)
• Cartilage ✓ (chondrification of mesenchyme)
• Skeletal muscle ✓ (from mesoderm/somites — a type of mesenchyme)
• Connective tissue, blood vessels, dermis, dental pulp (dental papilla mesenchyme)
• Epithelium (skin, oral mucosa, enamel organ) = ectodermal origin.
• Enamel = ectoderm (ameloblasts). Dentin, cementum, pulp, PDL = mesenchyme (ectomesenchyme from neural crest).
Mesenchymal derivatives include:
• Bone ✓ (ossification of mesenchyme)
• Cartilage ✓ (chondrification of mesenchyme)
• Skeletal muscle ✓ (from mesoderm/somites — a type of mesenchyme)
• Connective tissue, blood vessels, dermis, dental pulp (dental papilla mesenchyme)
• Epithelium (skin, oral mucosa, enamel organ) = ectodermal origin.
• Enamel = ectoderm (ameloblasts). Dentin, cementum, pulp, PDL = mesenchyme (ectomesenchyme from neural crest).
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