Glial cells are divided into two major classes of cell types: microglia and macroglia.    From Wordnik.com.  [Conservapedia - Recent changes [en]] Reference

They are expressed in cell types supposed to be involved in MS development such as neurons, endothelial cells, oligodendrocytes, macrophages/macroglia and lymphocytes.    From Wordnik.com.  [PLoS ONE Alerts: New Articles] Reference