Myelin
The fatty substance that covers and protects nerves.
Myelin is a layered tissue that sheathes the axons (nerve fibers).
This sheath around the axon acts like a conduit in an electrical system, ensuring that messages sent by axons are not lost en route.
It allows efficient conduction of action potentials down the axon.
Myelin consists of 70% lipids (cholesterol and phospholipid) and 30% proteins.
It is produced by oligodendrocytes in the central nervous system.