Look up: neurons

1. Neurons
   Neurons are our body's chemical messengers. 10-12 billion neurons make up our nervous system that transmit information to and from our brain and around our body. 80% of the body's neurons are found on the outer layer of the brain, our cerebral cortex. Neurons are of three main types, sensory neurons, motor neurons, and interneurons.
   Found on http://www.gerardkeegan.co.uk/glossary/g
   
   
2. neurons
   Any of the conducting cells of the nervous system. A typical neuron consists of a cell body, containing the nucleus and the surrounding cytoplasm (perikaryon); several short radiating processes (dendrites); and one long process (the axon), which terminates in twiglike branches (telodendrons) and may...
   Found on http://www.mondofacto.com/facts/dictiona