Written by Pam MS, NCSP | Fact checked by Psychology Dictionary staff 

is the insulatory coating which covers some neurons in the central nervous system interrupted at gaps in-between sheaths which are called Nodes of Ranvier. Myelin sheaths are formed by Schwann cells which secrete myelin.

MYELIN SHEATH: "The myelin sheath is a coating of myelin of some neurons which allows the process of saltatory conduct."

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