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2. List of ICD-9 codes 320–389: diseases of the nervous system ...

   en.wikipedia.org/wiki/List_of_ICD-9_codes_320...

   320.9 Meningitis due to unspecified bacterium; ... 323.4* Other encephalitis due to infection; ... 331.9 Unspecified; 332 Parkinson's disease.

3. Parkinson's disease - Wikipedia

   en.wikipedia.org/wiki/Parkinson's_disease

   Parkinson's disease (PD), or simply Parkinson's, is a neurodegenerative disease primarily of the central nervous system, affecting both motor and non-motor systems. Symptoms typically develop gradually, with non-motor issues becoming more prevalent as the disease progresses.

4. Parkinson's disease and gut-brain axis - Wikipedia

   en.wikipedia.org/wiki/Parkinson's_Disease_and_Gut...

   Parkinson's disease (PD), the second most common neurodegenerative disease after Alzheimer's disease, affects 1% of people over 60 years of age. [1] [2] [3] In the past three decades, the number of PD cases has doubled globally from 2.5 million in 1990 to 6.1 million in 2016. [4] [5] As of 2022, there are ~10 million PD cases globally. [6]

5. Extrapyramidal symptoms - Wikipedia

   en.wikipedia.org/wiki/Extrapyramidal_symptoms

   Although Parkinson's disease is primarily a disease of the nigrostriatal pathway and not the extrapyramidal system, loss of dopaminergic neurons in the substantia nigra leads to dysregulation of the extrapyramidal system. Since this system regulates posture and skeletal muscle tone, a result is the characteristic bradykinesia of Parkinson's.

6. Parkinsonism - Wikipedia

   en.wikipedia.org/wiki/Parkinsonism

   Parkinsonism is a clinical syndrome characterized by tremor, bradykinesia (slowed movements), rigidity, and postural instability. [1] [2] Both hypokinetic (bradykinesia and akinesia) as well as hyperkinetic (cogwheel rigidity and tremors at rest) features are displayed by Parkinsonism. [3]

7. Basal ganglia disease - Wikipedia

   en.wikipedia.org/wiki/Basal_ganglia_disease

   The muscle rigidity, tremor at rest, and slowness in initiation and execution of movement that are the cardinal motor symptoms of Parkinson's disease are attributed to a reduction in dopaminergic activity in the basal ganglia motor areas, particularly the putamen, due to gradually reduced innervation from the pars compacta of substantia nigra. [6]