dorsal root

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dorsal root

n.
Either of the two roots of a spinal nerve, consisting of sensory fibers and arising from the posterior section of the spinal cord.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.dorsal root - one of the two roots of a spinal nerve that passes dorsally to the spinal cord and that consists of sensory fibers
afferent, afferent nerve, sensory nerve - a nerve that passes impulses from receptors toward or to the central nervous system
nervus spinalis, spinal nerve - any of the 31 pairs of nerves emerging from each side of the spinal cord (each attached to the cord by two roots: ventral and dorsal)
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
The descending corticospinal tracts and ascending dorsal columns decussate in the medulla while the ascending lateral spinothalamic tracts decussate within one or two levels of the entrance of the dorsal roots. As a result, injury to the hemicord results in contralateral loss of pain and temperature below the level of the insult, ipsilateral hemiparesis/hemiplegia as well as ipsilateral loss of proprioception and vibration sense.
The paired PSA originate from the vertebral arteries or PICAs and then descend medial to the dorsal roots forming an anastomotic network dorsally that supplies the posterior third of the cord [2, 4].
Conservative treatment was initiated with neuroleptic drugs and blocks of the L1/L2 dorsal roots with local anaesthetics and pulsed radiofrequency lesioning.
After stimulation and control CMGs, spinal dorsal roots from L5 to S3 were transected sequentially.
Some authors consider that PDLs coincide with the axial lines of Sherrington, which are virtual lines that separate dermatomes arising from nonconsecutive dorsal roots [8, 9].
Comment: Persistent mechanical irritation of the nerve root (as seen with degenerated or herniated discs) sets up a series of events that lead to chronic pain, mediated by sensitization of the dorsal roots and dorsal horns in the spinal cord.
The dorsal roots of L2 and L3 have lesser branches, which make up the lateral cutaneous nerve of the thigh, and greater branches, that along with the dorsal root of L4 are the origins of the femoral nerve.
Randiac, "Excitatory amino acid-mediated components of synaptically evoked input from dorsal roots to deep dorsal horn neurons in the rat spinal cord slice," Neuroscience Letters, vol.
Effect of Lissauer tract stimulation on activity in dorsal roots and in ventral roots.
(The ventral and dorsal roots contain nerves that leave and enter the spinal cord, respectively.) After the axons within this surgically connected nerve have time to regenerate to the target site, the patient can initiate voiding by scratching or gently squeezing their legs or buttocks--i.e., the skin associated with the L5 dermatome--for about ten seconds.
A similar preparation was used for identifying afferent mechanosensory activity in the dorsal roots. Here the muscles were stimulated mechanically with a fine rod driven either manually or with a loudspeaker activated by pulse generator (Master-8, AMPI).
The dorsal root entry zone (DREZ) forms the junction between the dorsal roots of the PNS and the spinal cord (CNS).