Electron microscopy of terminal buds on the barbels of the silurid fish, Corydoras paleatus

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Abstract
The terminal buds of the Corydoras paleatus were observed with the electron microscope. Almost all the cells constituting the buds can be classified into two distinct cell types, supporting and receptor cells. In addition, a few cells designated as basal cells exist in the bottom of the buds and appear to be an immature form of each distinct cell type in the course of cell renewal. The receptor cells are characterized by the presence of tubules extending from the apical process. By the application of lanthanum nitrate as an extracellular marker, we demonstrated that the tubular system is in continuity with the extracellular space. The data suggest that the tubular system represents an amplification of the apical cell surface as a particular site of chemoreceptive activities, although we do not rule out a role for active absorptions of ions in a very hypotonic environment.