<prompt> Oligodendrocytes are impoant in :Blood brain barrierMyelin formationPhagocytosisChemotaxis  <response>: B i.e. Myelin formationMn: 1SPM - degCMO i.e., Schwann cell Mylinate peripheral nervous system in 1:1 basis ; and Central nervous system is mylinated by Oligndendrocyte in 1:50 basis. 