You searched for: “oligodendroglia
oligodendroglia (s) (noun), oligodendroglias (pl)
1. Neuroglia consisting of cells similar to but smaller than astrocytes, found in the central nervous system and associated with the formation of myelin.
2. A class of neuroglial (macroglial) cells in the central nervous system.
3. Etymology: from Greek, literally meaning, "few tree cells".

The important function of these cells is the formation of insulating myelin sheaths of axons in the central nervous system.