The document provides an overview of the nervous system, including its main functions and divisions. It discusses the central nervous system (CNS), which includes the brain and spinal cord, and the peripheral nervous system (PNS), which branches out from the CNS. Within these systems are neurons, the main cell type, and neuroglia which support neuron function. The document outlines the structure of neurons and how nerve impulses are conducted. It also describes the divisions of the nervous system including somatic, autonomic, afferent and efferent systems.