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.
Spinal Nerves. Nerves that are originating from the spinal cord are known as spinal nerves. There are 31 pairs of spinal nerves that are named in relation to their location on the spinal cord. All of these nerves are mixed nerves, so that each nerve consists of both ventral (motor) and dorsal root (sensory) components.asically brain and spinal cord make up the central nervous system, while their branches make up the peripheral nervous system. Depending on the originating place (either brain or spinal cord), peripheral nervous system can be classified into two categories; namely, cranial nerves and spinal nerves.