commissure

English Thesaurus

1. a bundle of nerve fibers passing from one side to the other of the brain or spinal cord (noun.body)

hypernym	:	nerve pathway, nerve tract, pathway, tract,
definition	:	a bundle of myelinated nerve fibers following a path through the brain (noun.body)

hyponym	:	corpus callosum,
definition	:	a broad transverse nerve tract connecting the two cerebral hemispheres (noun.body)