<unk>  (from Greek α- [used as a negative prefix] + -τάξις [order], meaning "lack of order") is a neurological sign and symptom consisting of gross incoordination of muscle movements .<unk>  is an aspecific clinical manifestation implying dysfunction of parts of the nervous system that coordinate movement, such as the cerebellum  Several possible causes exist for these patterns of neurological dysfunction.  The term "dystaxia" is rarely used as a synonym.<unk>  results from the involvement of cerebellar structures, or from a combination of cerebellar and extra-cerebellar lesions, especially the brainstem .<unk>  can be of several types:
Sporadic<unk> s.<unk> s of this type usually begin in adulthood and have no known family history.
Hereditary<unk> s. These<unk> s are caused by a defect in a gene that is present from the start of a person's life and can be either dominantly inherited or recessively inherited. Recessive disorders commonly cause symptoms to begin in childhood rather than in adulthood.
Ataxia
Quassia
Myokmia
Aspermia
Photophobia
Aphonia
Oscillopsia
Pallor