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Historic Embryology
Oscar Hertwig (1849-1922)

Oscar Hertwig (1849-1922) was a German embryologist and anatomist who first identified in amphibia tooth development, and was subsequently named Hertwig's epithelial root sheath (HERS). In amphibia, this is a permanent structure. In mammals, this is a transient structure, assembled during early tooth root formation and elongation. Later the HERS becomes fenestrated and reduced to the epithelial rests of Malassez (ERM).[1]

  1. Luan X, Ito Y & Diekwisch TG. (2006). Evolution and development of Hertwig's epithelial root sheath. Dev. Dyn. , 235, 1167-80. PMID: 16450392 DOI.