Nerve cell. Coloured transmission electron micrograph (TEM) of a neurone embedded in grey matter in the central nervous system. The neurone consists of a cell body and a single nerve fibre (axon), The cell body, also known as the perikaryon, contains the neurone's nucleus with a clear nucleolus. The axon transmits nerve impulses away from the cell body. The grey matter consists of other nerve cells, myelinated nerve fibres, support cells and capillaries (right). Magnification: x1800 when printed at 10 centimetres wide.