Amelogenesis — MFDS Part 1 MCQ

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ModerateAnatomy (Head & Neck)AmelogenesisMFDS Part 1

During the bell stage of tooth development, cells adjacent to the dental papilla elongate, reverse their polarity and pass through a preameloblast stage before becoming enamel-secreting ameloblasts. From which layer of the enamel organ do these cells arise?

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Correct answer: C — Inner enamel epithelium

The correct answer is **A, inner enamel epithelium**. During the bell stage, inner enamel epithelial cells adjacent to the dental papilla elongate and differentiate through preameloblast and presecretory stages into ameloblasts, which produce enamel matrix. The outer enamel epithelium forms the external boundary of the enamel organ rather than ameloblasts. The stellate reticulum provides structural support, while the stratum intermedium supports ameloblast function and enamel mineralisation but does not itself give rise to ameloblasts. The dental papilla is ectomesenchymal rather than part of the enamel organ; its peripheral cells differentiate into odontoblasts, and its central tissue forms the dental pulp.

Reference: Matthiessen ME, Rømert P. Ultrastructure of the human enamel organ. II. Internal enamel epithelium, preameloblasts, and secretory ameloblasts. Cell and Tissue Research. 1980;205(3):371–382. https://pubmed.ncbi.nlm.nih.gov/7357579/