ABSTRACT
The system of SCCs consists of single chemosensory cells more or less randomly distributed over the body of fishes. The innervation of sees depends on their location on the body and includes cranial and spinal nerves. The function of sees in fish is known only for a few species with specialized sec systems. Despite the morphological similarities of SCCs, taste bud cells, and cells of Schreiner organs, the problem of a possible relationship among them has yet to be resolved. However, SCCs are not confined to aquatic animals, they also exist in higher taxa and hence represent a highly conserved chemosensory modality. Key Words: Olfaction; Taste; Ultrastructure; Electron microscope; Evolution.
