Hippocampus neuron Coloured transmission electron micrograph TEM of a section through a neuron from the hippocampus a structure in the brain responsible for longterm memory Neurons are responsible for passing information around the central nervous system CNS and from the CNS to the rest of the body The neuron consists of a cell body with a large nucleus pale brown and inner nucleolus dark brown The single nerve fibre axon right transmits nerve impulses away from the cell body The surrounding material is the brains grey matter Magnification x when printed at centimetres wide