ABSTRACT
Anatomically, the human nervous system is subdivided into the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS contains the brain and the spinal cord. The PNS resides outside the CNS and functions to receive input from the environment and innervate muscle tissue for motor control. To accomplish this task, the PNS consists of cranial nerves arising from the brain, spinal nerves originating from the spinal cord, and sensory nerve cell bodies. Sensory information is transmitted to the CNS through afferent bers in the dorsal spinal roots, while outgoing efferent motor bers originating within the ventral horns of the spinal cord serve the limbs and organs in terms of coordinating body movement.
