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Neuroglia. This image is a high magnification of the gray matter of an anterior horn illustrating the nuclei of neuroglia. Oligodendrocytes are indicated by the red arrows and a single astrocyte by the green arrow. Microglia (black arrows) represent a third type of neuroglia. These cells are identified by their nuclei which tend to be smaller than oligodendrocytes and somewhat flattened and dark-staining. Microglia are considered to be phagocytic.