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World J Psychiatry. Mar 19, 2025; 15(3): 99901
Published online Mar 19, 2025. doi: 10.5498/wjp.v15.i3.99901
Table 1 Time course and stages of Parkinson's disease
Phase
Potential neurotransmitters/source
Symptoms
Location
Advanced (late nonmotor and motor symptoms)Ach/basal forebrain orexin/posterior hypothalamus histamine/TMNGABA/ventrolateral preoptic areaEmotional and cognitive disturbancesCortex
Symptomatic (motor and nonmotor manifestations)Dopamine/substantia nigra parscompactaSerotonin/dorsal and ventralraphe nucleiDyskinesia motor fluctuation movement problemsSubstantia nigra
Prodromal (early nonmotor symptoms)Ach/ventral tegmental area GABA/ventral tegmental area epinephrine/locus coeruleus glutamate/sub-coeruleus areaHyposmiaOlfactory bulb
Sleep disordersBrain stem
Autonomic dysfunctionVagus nerve
ConstipationEnteric nervous plexuses of the foregut