" The dorsal root ganglia are located all along the spinal column, at the level of each vertebra, one on each side of the spine, linking the body’s periphery with the spinal cord, that is, connecting peripheral nerve fibers to the central nervous system. This is one of the routes for conveying sensory signals from limbs and torso to the central nervous system. Information about the face is also transmitted centrally by two large but lonely ganglia: the trigeminal ganglia, one on each side of the brain stem. "

― António R. Damásio , The Strange Order of Things: Life, Feeling, and the Making of Cultures