Violations of coordination of movements are designated by the term "ataxia". Ataxia is the mismatch of the work of various muscle groups, leading to a violation of the accuracy, proportionality, rhythmicity, speed and amplitude of voluntary movements, as well as to a violation of the ability to maintain balance. Violations of coordination of movements can be caused by the defeat of the cerebellum and its connections, disorders of deep sensitivity; asymmetry of vestibular influences. Accordingly, distinguish cerebellum, sensitive and vestibular ataxia.