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myelin sheath. noun. The insulating envelope of myelin that surrounds the core of a nerve fiber or axon and facilitates the transmission of nerve impulses. In the peripheral nervous system, the sheath is formed from the membrane of the Schwann cell, and in the central nervous system it is formed from oligodendrocytes.
exists and is an alternate of . The myelin sheath is composed of lipids, which are fats, they make for good protection as well as conductors for the electrical impulses of the brain. That is one reason that young babies need fat in their diets or else they wont get enough and the sheath may not be as developed as it should be.