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In the human there are 31 pairs of spinal nerves, one on each side of the vertebral column. These are grouped into the corresponding cervical, thoracic, lumbar, sacral and coccygeal regions of the spine.
Each segment gives rise to paired spinal nerves (click left image). Dorsal and ventral spinal roots arise as a series of rootlets. A spinal ganglion is present distally on each dorsal root. The canine spinal cord has 8 cervical, 13 thoracic, 7 lumbar, 3 sacral and 5 caudal segments. The following table compares species.