Noun
a layer of myelin encasing (and insulating) the axons of medullated nerve fibers
Source: WordNetMyelin is a fatty substance that coats the axons, speeding up synaptic transmission. Myelanation... is generally completed by age twenty. Multiple sclerosis is one of several degenerative diseases that can affect the myelin sheath... Daniel Levitin
Inflammation of the optic nerve causes loss of vision, usually because of the swelling and destruction of the myelin sheath covering the optic nerve. Source: Internet
Nerve axon with myelin sheath Secondary progressive MS occurs in around 65% of those with initial relapsing-remitting MS, who eventually have progressive neurologic decline between acute attacks without any definite periods of remission. Source: Internet
Most mutations in CMT affect the myelin sheath, but some affect the axon. Source: Internet
The intertwining hydrocarbon chains of sphingomyelin serve to strengthen the myelin sheath. Source: Internet
The myelin sheath allows nerve cells to conduct signals faster. Source: Internet