OntologiesgoclassesGO:0043209   
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myelin sheath
http://purl.obolibrary.org/obo/GO_0043209

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.

Also appears inhcaodhbaprideflopozp + 18
Narrow Synonyms
astrocyte sheath
oligodendrocyte myelin sheath
Schwann cell myelin sheath