Neurons either have a myelin coating or are devoid of a myelin coating. Myelin is there to provide support to the cell for conduction. The process of the material which creates the myelin (neurolemmocyte or oligodendrocyte) encompasses the appropriate section of the axon or dendrite is known as myelination. A white lipid protein which supports the myelination process of the specific ganglia is known as myelin. As numerous neuroglia are situated in succession, a myelin layer that encircles the axon or dendrite is formed. Myelinated neurons occur both in the CNS and the PNS.
The white matter of the brain is created by myelin. The white coloration of the spinal cord and nerves is also determined by myelin. In the PNS, myelination happens when the neurolemmocytes grow around the axon or dendrite. The outer myelin sheath is then encompassed in an additional sheath known as a glycoprotein neurolemmal sheath which is designed to help protect the myelin as well as assist with regeneration in the event the neuron suffers injury or tearing. Each axon is only partially encompassed in this myelin sheath, leaving gaps in between of about 1 millimeter wrapped portions. The gaps between the adjacent lemmocytes are known as neurofibril nodes. The fibril node is responsible for the nerve impulse propulsion along the neuron. A neurolemmocyte forms a sheath around just one axon at a time while the oligodendrocyte forms the sheath around multiple axons as at once.
Myelination videos
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How the Body Works : Anatomy of a Nerve
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http://www.youtube.com/v/XgIaAs_ONG4
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