1 Many, a majority of companies in this research do take a strategic approach to digital. 2  From talking to companies, I find the creation of digital plans often occurs in two stages.First a separate digital marketing plan is created.
medullary sheath myelin sheath. myelin sheath (nerve sheath) the sheath surrounding the axon of myelinated nerve cells, consisting of concentric layers of myelin formed in the peripheral nervous system by the plasma membrane of Schwann cells, and in the central nervous system by the plasma membrane of oligodendrocytes.
Myelin is the insulating layer which, along with fatty acids*, surrounds nerve fibres. This protects nerves just like the insulation arround electrical cables. In B12 deficiency, toxic 15-17 coal atom fatty acids have a demyelinating effect on nerves, and electrical impulse transmission is disturbed.