How does Spinocerebellar Ataxia affect the other organ systems?

I'm doing a disease project and I'm a bit lost. I'm searching for all the organ systems that SCA would affect and what it does to each system. I've got nervous and muscle-- if im wrong, please correct me. Are there any other systems that are affected?

Ataxia with Identified Genetic and Biochemical Defects
Last Updated: January 19, 2007 Email to a Colleague

Synonyms and related keywords: abetalipoproteinemia, Angelman syndrome, arginase, argininemia, argininosuccinate lyase, argininosuccinate synthetase, argininosuccinic acidemia, ataxia telangiectasia, ataxia with selective vitamin E deficiency, ataxia with oculomotor apraxia, AOA, autosomal dominant ataxias, autosomal recessive ataxia, biotinidase deficiency, carbamyl phosphate synthetase deficiency, CPS deficiency, congenital disorders of glycosylation syndrome, cerebrotendinous xanthomatosis, Cockayne syndrome, CBS, Dandy Walker syndrome, defects of mitochondrial beta oxidation, dentatorubropallidoluysian atrophy, DRPLA, episodic ataxia type 1, EA1, episodic ataxia type 2, EA2, fragile X鈥揳ssociated tremor/ataxia syndrome, FXTAS, Friedreich's ataxia, Friedreich ataxia, GM2 gangliosidosis, Gaucher type III, Hartnup's disease, Hartnup disease, hypobetalipoproteinemia, Krabbe's globoid cell leukodystrophy, L-2 hydroxyglutaric acidemia, Lafora bodydisease, late infantile and juvenile sphingolipidoses, late infantile neuronal ceroid lipofuscinosis, late-onset urea cycle defects, Leigh's disease, Leigh disease, leukoencephalopathy with vanishing white matter, leukoencephalopathy with VWM, maple syrup urine disease, metabolic ataxias, metachromatic leukodystrophy, mitochondrial cytopathies, myoclonic epilepsy with ragged red fibers, MERRF, NARP syndrome, neuropathy ataxia retinitis pigmentosa, Niemann-Pick C disease, ornithine transcarbamylase deficiency, OTC deficiency, recessively inherited metabolic ataxias, Refsum's disease, Refsum disease, progressive myoclonic epilepsies, pyruvate dehydrogenase deficiency, pyruvate carboxylase deficiency, spinocerebellar ataxias, succinic-semialdehyde dehydrogenase deficiency, urea cycle defects, Unverricht-Lundborg disease, xeroderma pigmentosum, XP, metabolic disorder