Neurotransmitter: A chemical that is released from a nerve cell which thereby transmits an impulse from a nerve cell to another nerve, muscle, organ, or other tissue. A neurotransmitter is a messenger of neurologic information from one cell to another.
Quick GuideDementia, Alzheimer's Disease, and Aging Brains
Subscribe to MedicineNet's General Health Newsletter
Brain and Nervous System Resources
Last Editorial Review: 5/13/2016