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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.
Myelin is a fatty membrane layer that surrounds nerve fibers. The function of myelin includes: (choose all answers that you think are correct). Question options: a) pass current from one neuron to another. b) provide nutrients to the nerve. c) support the axon and hold nerve fibers together.