A bundle of axons located within the central nervous system.
A series of organs or tubes which allow something to pass from one part of the body to another.
A series or bundle of nerve fibres connecting two areas of the nervous system and transmitting nervous impulses in one or in both directions.
Group of organs and tissues concerned with a common function or arranged serially (e.g., the digestive tract or the respiratory tract).
A group of nerve fibers passing from one part of the brain or spinal cord to another, forming a distinct pathway, e.g. the spinothalamic tract, pyramidal tract, and corticospinal tract.
Each member within a cluster of organs collectively contributes to a specific function through a shared pathway. The term also alludes to a bundle of nerve fibers working together to serve a common purpose.
A route or direction followed.
A collection of nerve fibers; any nerve pathway in the spinal cord or brain.
A collection of body parts or organs that work together to perform a specific function, like the digestive, respiratory, or urinary systems.