We took a look at the involvement of both the central nervous system and the peripheral nervous system in maintaining homeostasis. The relationship between CNS and PNS in sensory evaluation and motor responses, and how the PNS directs the impulses from the CNS to the correct effector was discussed. The anatomy of the PNS into two divisions, the sensory and motor, and then into somatic and autonomic, each with its own type of response was discussed. How the sympathetic and parasympathetic system work together to insure homeostasis was also discussed.