Most nerve cell fibers outside the brain and spinal cord are wrapped by a thin layer of cells that form a "tunnel" that damaged fibers can follow as they repair themselves.This thin layer of cells is known as __________.

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The Answer of Most nerve cell fibers outside the brain and spinal cord are wrapped by a thin layer of cells that form a "tunnel" that damaged fibers can follow as they repair themselves.This thin layer of cells is known as __________.

Most Nerve Cell Fibers Outside the Brain and Spinal Cord