Master Typical Spinal Nerve | Upper Limb Lower Limb A typical spinal nerve is a mixed nerve, meaning it contains both sensory and motor fibers, that connects the spinal cord to the rest of the body. There are 31 pairs of spinal nerves, categorized into cervical, thoracic, lumbar, sacral, and coccygeal regions. Each spinal nerve originates from the spinal cord as two roots: a dorsal (sensory) root and a ventral (motor) root, which then merge to form the mixed nerve. These nerves exit the vertebra