A
neural pathway,
neural tract, or
neural face, connects one part of the
nervous system with another via a bundle of
axons, the long fibers of
neurons. A neural pathway that serves to connect relatively distant areas of the
brain or nervous system is usually a bundle of neurons, known collectively as
white matter. A neural pathway that spans a shorter distance between structures, such as most of the pathways of the major
neurotransmitter systems, is usually called
grey matter.