Sex is a primary reward and it is the basis of pair-bond formation in voles. The striatum is part of the neuronal circuitry underlying a remarkable pair-bond formation in which both partners remain monogamous. It is important to note that the role of the striatum extends beyond that of movement and reward.
in human nervous system: The spinal cord. Associated with local regions of the spinal cord and imposing on it an external segmentation are 31 pairs of spinal nerves, each of which receives and furnishes one dorsal and one ventral root.
Human Anatomy Â» Basic Anatomy Â» Spinal Nerves. Spinal nerve is generally defined as a mixed nerve, which carries motor, sensory and autonomic signals between spinal cord and the body. There are 31 pairs of spinal nerves, including 8 cervical, 12 thoracic, 5 lumbar, 5 sacral, and 1 coccygeal.rea of skin supplied by a single segment of spinal cord is called a dermatome. Each spinal nerve is connected with the spinal cord by two roots, a ventral root which is motor, and a dorsal root which is sensory. The dorsal root is characterized by the presence of a spinal ganglion at its distal end.