The document discusses the structure and function of neurons and the nervous system in 3 paragraphs: 1) It describes the basic parts of a neuron including the cell body, dendrites, axon, and myelin sheath. It explains how neurons communicate via action potentials and neurotransmitters at synapses. 2) It provides an overview of the central nervous system (brain and spinal cord) and peripheral nervous system. It also mentions the sympathetic and parasympathetic nervous systems. 3) It briefly introduces several areas of the brain including the hindbrain, midbrain, forebrain, and cortex. It notes some of the functions of the cerebellum, medulla, and thalamus.