Ameloblasts and odontoblasts in tooth development - advanced bell stage, human, embryo

Stain: Hematoxylin and eosin. From top to bottom: Stellate reticulum consisting of a loose network of ectoderm-derived cells; Cell layers of the stratum intermedium; Palisade-arranged columnar presecretory ameloblasts at the distal side oriented towards the basal lamina enforced by deposited collagen; Columnar odontoblasts in a epithelioid arrangement with their secretion area close to the same basal lamina; Mesenchym-derived fibroblast-like cells (so-called pulpal cells) of the dental papilla (future pulp).