The speed at which your nerve impulses travels is dependent on the type of fiber. On fibers that allow the nerve to travel faster can reach speeds of over 200 miles per hour.
Myelin sheath is a covering of neurons and it does not travel.
That substance is called the myelin cell or myelin sheath.
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An insulating layer that surrounds the axon is a myelin sheath.
The endoneurium surrounds and protects the myelin sheath.
Myelin sheath
Myelin covers the axon to protect it and help messages travel faster. Two types of cells produce myelin, the oligodendrocytes in the CNS and Schwann cells in the PNS.
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.
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