Information, in the form of electrical impulses, travels along neural pathways composed of interconnected neurons. Neuron cells are composed of three basic elements: the cell body, the axon, and the dendrite. Axons are long fibers, sometimes branched, which extend out of the cell body and transmit electrical impulses to the next neuron. Electrical impulses generated by a presynaptic neuron are transmitted by way of neurotransmitters (messenger chemicals) across a synaptic cleft and to the postsynaptic neuron, which then propagates the electrical signal onward to its eventual destination.