[External adamantine epithelium, stellate reticulum and intermediate stratum of the enamel organ of the incisor in the rat: ultrastructural study of sections and after freeze fracturing].

A morphological study of the cells of the outer epithelium layer, of the stellate reticulum and of the stratum intermedium of the rat incisor on thin sections and after freeze-etching allowed the differentiation of an intracellular and an intercellular compartment. Both were implicated in transport and diffusion phenomenons. The structure of these cells suggested that they synthetize non exportable proteins. Nevertheless they could be implicated in some none precised activities of biosynthesis and secretion.