. "\"An electrically insulating fatty layer that surrounds the axons of many neurons. It is an outgrowth of glial cells: Schwann cells supply the myelin for peripheral neurons while oligodendrocytes supply it to those of the central nervous system.\" [GOC:jl, NIF_Subcellular:sao-593830697, Wikipedia:Myelin]" . . "myelin sheath" . "Schwann Cell Myelin Sheath" . "Wikipedia:Myelin" . "NIF_Subcellular:sao-593830697" . .