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.
Any of the nerves that arise in pairs from the spinal cord. The spinal nerves are distinguished from the cranial nerves, which, apart from the vagus nerve, are limited in their distribution to the head and neck. Like the cranial nerves, the spinal nerves are part of the peripheral nervous system.There are 31 pairs of spinal nerves in the human body: 8 cervical, 12 thoracic, 5 lumbar, 5 sacral, and 1 coccygeal. These emerge through spaces between the vertebrae.t consists solely of motor nerve fibers. The posterior root springs from the posterior part of the spinal cord, and consists of fibers which lead to the posterior column of the cord. These fibers are all sensory fibers.