Brain
There are dozens of other chemical neurotransmitters that are used in more limited areas of the brain, often areas dedicated to a particular function. Serotonin, for example—the primary target of antidepressant drugs and many dietary aids—comes exclusively from a small brainstem area called the raphe nuclei. Norepinephrine, which is involved in arousal, comes exclusively from a nearby small area called the locus coeruleus. Other neurotransmitters such as acetylcholine and dopamine have multiple sources in the brain, but are not as ubiquitously distributed as glutamate and GABA.
Andrea Brand
Brand has provided this “plain English” explanation of her work: “One of the goals of research in neurobiology is to repair or regenerate neurons after damage to the brain or spinal cord. Before we can understand how to repair the nervous system, however, we must first learn how the nervous system is put together. Of all the tissues and organs in the human body the nervous system is the most intricate and complex, consisting of more than one trillion neurons. These neurons make precise connections with each other to form functional networks that can transmit information at amazing speed over considerable distances.