2.84 understand that the central nervous system consists of the brain and spinal chord and is linked to sense organs by nerves

The nervous system is made of all of the neurones in your body (including sensory, relay and motor neurones). However, the central nervous system consists of only the brain and the spinal chord. The central nervous system (CNS) is linked to sense organs (eyes, skin, nose, tongue, ears) by sensory neurones (these are nerves).