Parkinson's disease as a multisystem disorder.

This article summarises the noteworthy contribution of Professor Jellinger to the understanding of Parkinson's disease (PD) as a disease affecting multiple body- and neurotransmitter-systems. Phosphorylated alpha-synuclein and the formation of Lewy pathology as neuropathological hallmarks of PD seem to spread from the enteric nervous system and the olfactory bulb in a rostrocranial direction to the CNS. Subsequently, a progressive degeneration of the dopaminergic-nigrostriatal system and widespread extranigral pathology affecting different anatomical structures and neurotransmitters are induced causing the various non-motor and motor symptoms of PD.