medullated nerve fiber

English Thesaurus

1. a nerve fiber encased in a sheath of myelin (noun.body)

hypernym	:	nerve fiber, nerve fibre,
definition	:	a threadlike extension of a nerve cell (noun.body)

part holonym	:	medullary sheath, myelin sheath,
definition	:	a layer of myelin encasing (and insulating) the axons of medullated nerve fibers (noun.body)