The posterior (dorsal)root of a spinal nerve and the posterior ramus are considered mixed nerves since they both carry sensory and motor information.

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The posterior (dorsal) root of a spinal nerve carries only sensory information, while the posterior ramus, a branch of the spinal nerve, carries both sensory and motor information, making only the latter a mixed nerve.

The Posterior (Dorsal)root of a Spinal Nerve and the Posterior