Anatomy and Physiology Review Transmitters
Gamma-aminobutyric acid (GABA)
Brain, brain stem, Nerve and muscle basal ganglia, spinal cord, cerebellum Possibly one-third of brain neurons.
Brain, spinal cord, PNS Medial brain stem, hypothalamus, dorsal horn of spinal cord.
Possible onset of sleep, mood control, pain pathway inhibitor.