CNS myelin is produced by special cells called oligodendrocytes. PNS myelin is produced by Schwann cells. The two types of myelin are chemically different, but they both perform the same function — to promote efficient transmission of a nerve impulse along the axon.
A good rule of thumb with anything in the body is that if something is insufficient merely add a hypo- before it... This isnusually in regards to such things as hormones.
