neurochemical pathway diagram

serotonin dopamine brain pathway anatomy hormone vector neurotransmitter system reward raphe accumbens nucleus cognitive human hippocampus synapse motor cortex health amygdala hypothalamus connection axis neocortex parkinson norepinephrine neurochemical acetylcholine cholinergic frontal substantia nigra ventral tegmental area pituitary mesocortical noradrenaline neurological compulsive psychiatric mood schizophrenia cerebellum illustration medical isolated striatum thalamus