Anatomy & Histology · single question
Which of the following is NOT a derivative of the mesenchyme (ectomesenchyme)?
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Correct answer: B. Oral mucosa epithelium
- A. Skeletal muscle is derived from mesoderm (a type of mesenchyme), specifically somites in the trunk and branchial arches in the head/neck.
- B. The epithelial layer of oral mucosa is derived from ectoderm, not mesenchyme. The lamina propria beneath it is mesenchymal. On board exams, 'mucosa' as the exception refers to its ectodermal epithelial lining. ✓
- C. Cartilage is a mesenchymal derivative; chondroblasts arise from mesenchyme.
- D. Bone is derived from mesenchyme (osteoblasts from ectomesenchyme in the craniofacial region).
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