The elucidation of the ultrastructure, cytochemistry and reactivity of cutaneous recep- tors is of particular importance in the unsolved biological problem of sensory transduc- tion. Topographically and with regard to evolution, cutaneous receptors are the most widespread primary sense organs. Because of their simple structure they are particular- ly useful in the study of the functional morphology of receptor end-organs. Research into receptor structures in classic neuromorphology revealed magnificent patterns and pictures of receptors, showing their great diversity and their presence in all...