Dorsal root ganglion:

Spinal cord with arrow indicating a dorsal root ganglion.

a cluster of cell bodies in the dorsal root of a spinal nerve. The dorsal root ganglia contain cell bodies for sensory nerves that carry sensory information to the spinal cord.

Learn more: Know your brain - Spinal cord

Watch this 2-Minute Neuroscience video to learn more about the exterior of the spinal cord and this video to learn more about the interior of the spinal cord.