Neuroglia cells. Coloured scanning electron micrograph (SEM) of cultured neuroglia cells (blue). These cells are found in nervous tissue and support nerve fibres both structurally and metabolically. They have numerous long processes (green) which attach them to other neuroglia cells (as seen here), and also to nerve cells. Neuroglia cells make up around half the mass of the central nervous system. Magnification: x1500 at 6x7cm size.