Neural network. Computer artwork of several nerve cells (neurons) forming a neural network. Neurons are responsible for passing information around the central nervous system (CNS), and from the CNS to the rest of the body, as electrical impulses. A nerve cell comprises a central nerve cell body surrounded by numerous extensions. Most of these are dendrites, which collect information from other nerve cells or from sensory cells. Each neuron also has an extension called an axon, through which information passes outwards to other cells, including other nerve cells and muscle fibres. The green colour is to illustrate GFP (green fluorescent protein), which can be used to visualise the activity of the brain.