NCIt synonyms : Ascending and Descending Tracts of Spinal Cord; Tracts of Spinal Cord; Spinal Cord Tracts;
NCIt definition : White matter in the spinal cord comprising longitudinally oriented nerve fibers (axons)
that transmit impulses in both directions: ascending tracts transmit sensory information
to the brain from the body, and descending tracts transmit impulses from the brain
to the muscles.;