myelin

https://doi.org/10.1351/goldbook.11896
Electrically insulating lipoprotein layers that are produced by glial cells and surround the axons of the neurons.
Note: It is produced by oligodendrocytes in the central nervous system and by Schwann cells in the peripheral nervous system.
See also: myelin sheath
Source:
PAC, 2015, 87, 841. (IUPAC Glossary of terms used in neurotoxicology (IUPAC Recommendations 2015)) on page 884 [Terms] [Paper]