GO:0043209

myelin sheath

Details: 
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]
Evidence Code: