Fasciculus of Lissauer Definition and Examples

Definition
noun
A small bundle of fibers situated longitudinally in the white matter, at the entrance of the dorsal root fibers at the dorsolateral sulcus
Supplement
The fasciculus of Lissauer is a small bundle of fibers containing centrally projecting axons from dorsal root ganglion cells. It runs longitudinally in the white matter and located in the dorsal part of the lateral funiculus. It was first described by German neurologist, Heinrich Lissauer (1861-1891).
The fasciculus of Lissauer occurs throughout the spinal cord, and is most developed in the upper cervical regions. It contains axons from the dorsal root ganglion cells associated with pain and temperature.¹
It also contains several fine non-myelinated fibers that are derived mostly from the dorsal roots (i.e. partly endogenous in origin), and are intimately related to the substantia gelatinosa.^{1, 2}
Synonym(s):

fasciculus of Lissauer
Lissauer’s tract
tract of Lissauer
dorsolateral fasciculus
dorsolateral tract
zone of Lissauer

See also:

non-myelinated fiber

axon

dorsal root ganglion

white matter

Reference(s):

¹ Posterolateral tract. Retrieved from https://en.wikipedia.org/wiki/Posterolateral-tract

² Wall PD, Lidierth M, Hillman P (December 1999). “Brief and prolonged effects of Lissauer tract stimulation on dorsal horn cells”. Pain 83 (3): 579–89.