Synapses. Computer artwork of synapses, the junctions between the ends (blue, swollen) of two nerve cells (neurons). Nerve cells are responsible for passing information around the central nervous system (CNS) and from the CNS to the rest of the body. This information is transmitted from one nerve cell to the next as an electrical impulse (yellow flash). Each nerve cell comprises dendrites, nerve cell extensions which collect information from other nerve cells or from sensory cells, and an axon, through which information passes outwards to other cells, including other nerve cells and muscle fibres. Here, the axons are surrounded by a myelin sheath (yellow), which insulates the axon, allowing signals to be transmitted more quickly.