part of enamel organ enamel epithelium BTO:0001723 BrendaTissueOBO In the developing tooth, the inner or internal layer of cells (ameloblasts) of the enamel organ that deposit the organic matrix of enamel, plus the outer or external layer of cuboidal cells. The reduced enamel epithelium is the remains of both layers after enamel formation is complete. dental epithelium reduced enamel epithelium