Bundle of nerve fibers (axons) connecting nuclei of the central nervous system
White matter tracts within a human brain, as visualized by MRI tractography
A nerve tract is a bundle of nerve fibers (axons) connecting nuclei of the central nervous system.[1][2][3] In the peripheral nervous system, this is known as a nerve fascicle, and has associated connective tissue. The main nerve tracts in the central nervous system are of three types: association fibers, commissural fibers, and projection fibers. A nerve tract may also be referred to as a commissure, decussation, or neural pathway. [4] A commissure connects the two cerebral hemispheres at the same levels, while a decussation connects at different levels (crosses obliquely).
^Moore, Keith; Dalley, Arthur (2005). Clinically Oriented Anatomy (5th ed.). LWW. pp. 47. ISBN 0-7817-3639-0. A bundle of nerve fibers (axons) connecting neighboring or distant nuclei of the CNS is a tract.
^Blumenfeld, Hal (2010). Neuroanatomy through clinical cases (2nd ed.). Sunderland, Mass.: Sinauer Associates. p. 22. ISBN 9780878936137.
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