[Optical and scanning electron microscopy observation of the mucosa of human fetal tongue].

The structural features of the human foetal tongue have been studied in foetuses from 8th to 20th week of pregnancy. The characteristics of the developing papillae as well as of epithelial and mesenchymal layers have been pointed out. An early differentiation of the mesenchymal tissue has been observed, concerning phenomena of cellular condensation and reticular fibers organization both in superficial and deep layers. The hypothesis of the existence of straight interactions between epithelium and mesenchyme also in the developing human tongue mucosa has been suggested. Also the observations at SEM demonstrate that from the 8th to the 20th week the epithelial surface of the tongue reaches a stable structural pattern. From 11th week a characteristic cellular polymorphism occurs: cells with microvilli that diminish progressively, ciliated cells that disappear almost completely at the 20th week and cells whose free surface show microplicae, definitive stage of the tongue cell evolution.