Main entry: nerve pathway, nerve tract, pathway, tract
Definition: a bundle of myelinated nerve fibers following a path through the brain
Main entry: tract
Definition: a system of body parts that together serve some particular purpose
Definition: a brief treatise on a subject of interest; published in the form of a booklet
Main entry: piece of ground, piece of land, tract, parcel, parcel of land
Definition: an extended area of land