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Neuroglia in the optic tectum of teleosts.

The morphology of the neuroglial cells of the optic tectum of Cyprinid teleosts (Cyprinus carpio and Barbus bocagei) was analyzed using two variants of the Golgi method (Colonnier and Meyer) and electron microscopy. Although the description of the results is based on the three classical neuroglial types (ependymocytes, astrocytes and oligodendrocytes), their analysis shows that the differentiation between astrocytes and oligodendrocytes is complex. Owing to the occurrence of numerous elements with intermediate characteristics, it is suggested that in Teleosts both glial types (astrocytes and oligodendrocytes) correspond to functional variants of a single cell type.