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."
Cite this page: N., Pam M.S., "MYELIN SHEATH," in, April 7, 2013, (accessed May 11, 2021).