indicating a transverse section of myelinated nerve fibers. (D) Electron microscopy of a myelinated axon in a mouse optic nerve at higher magnification. The axon is surrounded by multilamellar ...

Amazingly, a large myelinated axon may have up to 250 to 300 turns of myelin wrapping around it. The ratio between axon diameter and that of the total nerve fiber (axon and myelin) is 0.6–0.7 ...