That substance is called the myelin cell or myelin sheath.
axon of a neuron in the peripheral nervous system.Schwann cells form a myelin sheath around the Axon.
Myelin Sheath Myelin Sheath
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Myelin Sheath Myelin Sheath
An insulating layer that surrounds the axon is a myelin sheath.
Myelin sheath
The endoneurium surrounds and protects the myelin sheath.
A myelin sheath is a layer of myelin (a dielectric, or electric insulator) around the axon of a neuron.
Oligodendrocytes are specialized neurolgical cells that produce myelin sheath.
the Myelin Sheath Myelin Sheath Your welcome I had to look for it
oligodendrocytes for C.N.S. and shcwann cells for P.N.S.