Epithelial Cell Rests of Malassez — MFDS Part 1 MCQ
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Correct answer: E — Epithelial cells of Hertwig's epithelial root sheath
The correct answer is E. Hertwig's epithelial root sheath guides root development and subsequently fragments, leaving clusters of odontogenic epithelial cells within the periodontal ligament known as the epithelial cell rests of Malassez. Inner enamel epithelial cells differentiate into ameloblasts and are associated with enamel formation, not the adult periodontal ligament. Dental papilla ectomesenchyme gives rise principally to odontoblasts and dental pulp. Dental follicle ectomesenchyme contributes to cementoblasts, periodontal ligament fibroblasts and osteoblasts, but not to these epithelial rests. Osteoclasts arise from haematopoietic monocyte–macrophage precursors. The epithelial nature and periodontal location of the rests therefore distinguish them from the mesenchymal and haematopoietic distractors.
Reference: Xiong J, Gronthos S, Bartold PM. Role of the epithelial cell rests of Malassez in the development, maintenance and regeneration of periodontal ligament tissues. Periodontology 2000. 2013;63(1):217–233. https://pubmed.ncbi.nlm.nih.gov/23931062/