Definition of dorsal root
: the one of the two roots of a spinal nerve that passes dorsally to the spinal cord and consists of sensory fibers
First Known Use of dorsal root
Medical Definition of dorsal root
: the one of the two roots of a spinal nerve that passes posteriorly to the spinal cord separating the posterior and lateral funiculi and that consists of sensory fibers—called also posterior root; compare ventral root
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