lateral raphespinal tract
lateral raphespinal tract[TA]
a group of axons that arise in the nucleus raphe magnus, descend in the posterior portion of the lateral funiculus, and terminate primarily in the posterior (dorsal) horn. These serotoninergic fibers are involved in the inhibition of transmission of nociceptive information through the dorsal horn.
Synonym(s): tractus raphespinalis lateralis [TA]